easy - tree - 树
easy - flower - 花
easy - grass - 草
easy - leaf - 叶子
easy - branch - 树枝
easy - root - 根
easy - seed - 种子
easy - fruit - 水果
easy - plant - 植物
easy - bush - 灌木
easy - forest - 森林
easy - mountain - 山
easy - river - 河
easy - lake - 湖
easy - ocean - 海洋
easy - sea - 海
easy - beach - 海滩
easy - wave - 波浪
easy - sand - 沙子
easy - rock - 岩石
easy - stone - 石头
easy - soil - 土壤
easy - mud - 泥
easy - dirt - 泥土
easy - water - 水
easy - rain - 雨
easy - snow - 雪
easy - ice - 冰
easy - cloud - 云
easy - sky - 天空
easy - sun - 太阳
easy - moon - 月亮
easy - star - 星星
easy - wind - 风
easy - storm - 暴风雨
easy - thunder - 雷
easy - lightning - 闪电
easy - rainbow - 彩虹
easy - fog - 雾
easy - mist - 薄雾
easy - dew - 露水
easy - frost - 霜
easy - fire - 火
easy - flame - 火焰
easy - smoke - 烟
easy - ash - 灰烬
easy - coal - 煤
easy - diamond - 钻石
easy - gold - 金
easy - silver - 银
easy - copper - 铜
easy - iron - 铁
easy - metal - 金属
easy - mineral - 矿物
easy - crystal - 水晶
easy - gem - 宝石
easy - pearl - 珍珠
easy - shell - 贝壳
easy - coral - 珊瑚
easy - seaweed - 海藻
easy - moss - 苔藓
easy - fern - 蕨类
easy - bamboo - 竹子
easy - cactus - 仙人掌
easy - palm - 棕榈
easy - pine - 松树
easy - oak - 橡树
easy - maple - 枫树
medium - willow - 柳树
medium - birch - 桦树
medium - cedar - 雪松
medium - cypress - 柏树
medium - elm - 榆树
medium - ash - 白蜡树
medium - beech - 山毛榉
medium - poplar - 杨树
medium - aspen - 白杨
medium - sycamore - 梧桐
medium - chestnut - 栗树
medium - walnut - 核桃树
medium - cherry - 樱桃树
medium - apple - 苹果树
medium - pear - 梨树
medium - plum - 李树
medium - peach - 桃树
medium - apricot - 杏树
medium - magnolia - 木兰
medium - dogwood - 山茱萸
medium - redwood - 红杉
medium - sequoia - 巨杉
medium - eucalyptus - 桉树
medium - acacia - 相思树
medium - mahogany - 桃花心木
medium - teak - 柚木
medium - ebony - 乌木
medium - sandalwood - 檀香木
medium - rosewood - 红木
medium - ivy - 常春藤
medium - vine - 藤蔓
medium - creeper - 爬藤
medium - climber - 攀缘植物
medium - hedge - 树篱
medium - shrub - 灌木
medium - thicket - 灌木丛
medium - undergrowth - 下层植被
medium - canopy - 树冠
medium - foliage - 叶子
medium - blossom - 花朵
medium - bloom - 花
medium - bud - 花蕾
medium - petal - 花瓣
medium - stem - 茎
medium - stalk - 茎秆
medium - thorn - 刺
medium - bark - 树皮
medium - trunk - 树干
medium - sapling - 树苗
medium - seedling - 幼苗
medium - sprout - 新芽
medium - shoot - 嫩枝
medium - twig - 细枝
medium - stump - 树桩
medium - log - 圆木
medium - timber - 木材
medium - lumber - 木材
medium - firewood - 柴火
medium - kindling - 引火柴
medium - charcoal - 木炭
medium - peat - 泥炭
medium - turf - 草皮
medium - sod - 草皮
medium - lawn - 草坪
medium - meadow - 草地
medium - field - 田野
medium - pasture - 牧场
medium - prairie - 草原
medium - savanna - 热带草原
medium - steppe - 草原
medium - tundra - 苔原
medium - taiga - 针叶林
medium - rainforest - 雨林
medium - jungle - 丛林
medium - woodland - 林地
medium - grove - 小树林
medium - copse - 矮树林
medium - thicket - 灌木丛
medium - scrubland - 灌木地
medium - brushwood - 灌木林
medium - wilderness - 荒野
medium - wetland - 湿地
medium - swamp - 沼泽
medium - marsh - 沼泽
medium - bog - 泥沼
medium - fen - 沼泽
medium - moor - 荒野
medium - heath - 荒地
medium - dune - 沙丘
medium - oasis - 绿洲
medium - canyon - 峡谷
medium - gorge - 峡谷
medium - ravine - 峡谷
medium - valley - 山谷
medium - dale - 山谷
medium - glen - 幽谷
medium - hollow - 山谷
medium - basin - 盆地
medium - plain - 平原
medium - plateau - 高原
medium - mesa - 平顶山
medium - butte - 孤山
medium - cliff - 悬崖
medium - precipice - 悬崖
medium - crag - 峭壁
medium - bluff - 断崖
medium - escarpment - 陡坡
medium - slope - 斜坡
medium - hillside - 山坡
medium - foothill - 山麓
medium - ridge - 山脊
medium - crest - 山顶
medium - peak - 山峰
medium - summit - 山顶
medium - pinnacle - 顶峰
medium - volcano - 火山
medium - crater - 火山口
medium - caldera - 火山口
medium - lava - 熔岩
medium - magma - 岩浆
medium - eruption - 喷发
medium - geyser - 间歇泉
medium - hot spring - 温泉
medium - spring - 泉
medium - fountain - 泉水
medium - well - 井
medium - stream - 小溪
medium - brook - 小河
medium - creek - 小溪
medium - rivulet - 小河
medium - tributary - 支流
medium - rapids - 急流
medium - waterfall - 瀑布
medium - cascade - 小瀑布
medium - cataract - 大瀑布
hard - conifer - 针叶树
hard - deciduous - 落叶树
hard - evergreen - 常绿树
hard - broadleaf - 阔叶树
hard - hardwood - 硬木
hard - softwood - 软木
hard - sapwood - 边材
hard - heartwood - 心材
hard - cambium - 形成层
hard - phloem - 韧皮部
hard - xylem - 木质部
hard - chlorophyll - 叶绿素
hard - photosynthesis - 光合作用
hard - transpiration - 蒸腾作用
hard - respiration - 呼吸作用
hard - germination - 发芽
hard - pollination - 授粉
hard - fertilization - 受精
hard - propagation - 繁殖
hard - cultivation - 栽培
hard - horticulture - 园艺
hard - arboriculture - 树木栽培
hard - silviculture - 造林
hard - forestry - 林业
hard - deforestation - 森林砍伐
hard - reforestation - 重新造林
hard - afforestation - 植树造林
hard - conservation - 保护
hard - preservation - 保存
hard - ecosystem - 生态系统
hard - biodiversity - 生物多样性
hard - habitat - 栖息地
hard - biome - 生物群系
hard - estuary - 河口
hard - delta - 三角洲
hard - fjord - 峡湾
hard - sound - 海湾
hard - strait - 海峡
hard - channel - 海峡
hard - archipelago - 群岛
hard - atoll - 环礁
hard - lagoon - 泻湖
hard - reef - 礁石
hard - shoal - 浅滩
hard - sandbar - 沙洲
hard - spit - 沙嘴
hard - headland - 岬
hard - promontory - 海角
hard - peninsula - 半岛
hard - isthmus - 地峡
hard - coast - 海岸
hard - coastline - 海岸线
hard - shoreline - 海岸线
hard - littoral - 沿海地区
hard - tidemark - 潮汐线
hard - high tide - 高潮
hard - low tide - 低潮
hard - neap tide - 小潮
hard - spring tide - 大潮
hard - tidal pool - 潮池
hard - rockpool - 岩池
hard - current - 洋流
hard - undercurrent - 暗流
hard - undertow - 回流
hard - riptide - 离岸流
hard - eddy - 涡流
hard - whirlpool - 漩涡
hard - maelstrom - 大漩涡
hard - vortex - 漩涡
hard - wave crest - 波峰
hard - wave trough - 波谷
hard - breaker - 碎浪
hard - surf - 拍岸浪
hard - swell - 涌浪
hard - ripple - 涟漪
hard - tsunami - 海啸
hard - tidal wave - 潮汐波
hard - storm surge - 风暴潮
hard - monsoon - 季风
hard - typhoon - 台风
hard - hurricane - 飓风
hard - cyclone - 气旋
hard - tornado - 龙卷风
hard - twister - 旋风
hard - whirlwind - 旋风
hard - dust devil - 尘卷风
hard - sandstorm - 沙尘暴
hard - blizzard - 暴风雪
hard - squall - 狂风
hard - gale - 大风
hard - tempest - 暴风雨
hard - deluge - 暴雨
hard - downpour - 倾盆大雨
hard - drizzle - 细雨
hard - shower - 阵雨
hard - precipitation - 降水
hard - hail - 冰雹
hard - sleet - 雨夹雪
hard - snowflake - 雪花
hard - snowfall - 降雪
hard - avalanche - 雪崩
hard - glacier - 冰川
hard - iceberg - 冰山
hard - ice sheet - 冰盖
hard - ice shelf - 冰架
hard - ice floe - 浮冰
hard - pack ice - 浮冰群
hard - permafrost - 永冻层
hard - hoarfrost - 白霜
hard - rime - 雾凇
hard - icicle - 冰柱
hard - stalactite - 钟乳石
hard - stalagmite - 石笋
hard - limestone - 石灰岩
hard - marble - 大理石
hard - granite - 花岗岩
hard - basalt - 玄武岩
hard - obsidian - 黑曜石
hard - pumice - 浮石
hard - sandstone - 砂岩
hard - shale - 页岩
hard - slate - 板岩
hard - quartzite - 石英岩
hard - schist - 片岩
hard - gneiss - 片麻岩
hard - conglomerate - 砾岩
hard - breccia - 角砾岩
hard - sediment - 沉积物
hard - silt - 淤泥
hard - clay - 黏土
hard - loam - 壤土
hard - topsoil - 表层土
hard - subsoil - 底土
hard - bedrock - 基岩
hard - mantle - 地幔
hard - crust - 地壳
hard - core - 地核
hard - tectonic plate - 构造板块
hard - fault line - 断层线
hard - earthquake - 地震
hard - seismic - 地震的
hard - tremor - 震动
hard - aftershock - 余震
hard - epicenter - 震中
hard - magnitude - 震级
hard - richter scale - 里氏震级
hard - landslide - 滑坡
hard - mudslide - 泥石流
hard - rockfall - 落石
hard - erosion - 侵蚀
hard - weathering - 风化
hard - sedimentation - 沉积
hard - deposition - 沉积
hard - alluvium - 冲积层
hard - moraine - 冰碛
hard - scree - 碎石堆
hard - talus - 岩屑堆
hard - boulder - 巨石
hard - pebble - 卵石
hard - gravel - 砾石
hard - cobblestone - 鹅卵石
hard - bedding plane - 层理面
hard - stratum - 地层
hard - outcrop - 露头
hard - vein - 矿脉
hard - ore - 矿石
hard - deposit - 矿床
hard - fossil - 化石
hard - amber - 琥珀
hard - petrification - 石化
hard - mineralization - 矿化
hard - crystallization - 结晶
hard - gemstone - 宝石
hard - emerald - 祖母绿
hard - ruby - 红宝石
hard - sapphire - 蓝宝石
hard - topaz - 黄玉
hard - amethyst - 紫水晶
hard - turquoise - 绿松石
hard - jade - 翡翠
hard - opal - 蛋白石
hard - garnet - 石榴石
hard - quartz - 石英
hard - feldspar - 长石
hard - mica - 云母
hard - graphite - 石墨