- [countable]
a flat green part of a plant, growing from a stem or branch or from the root 叶；叶片；叶子 
lettuce/cabbage/oak leaves 莴苣叶；卷心菜叶；橡树叶 the dead leaves of autumn/the fall 秋天的枯叶 The leaves on the trees were beginning to turn from green to orange. 树上的叶子开始从绿色变成橙色。 - in leaf
Few trees are in leaf yet. 还没有几棵树长出叶子。 The trees are just coming into leaf. 树木正好在长叶子。
Collocations The living worldsee also bay leaf, curry leaf, fig leaf, maple leaf, tea leafThe living world 生物界 Animals 动物 - animals mate/breed/reproduce/feed (on something)
动物交配／繁育／繁殖／以…为食 - fish/amphibians swim/spawn (= lay eggs)
鱼／两栖动物游动／产卵 - birds fly/migrate/nest/sing
鸟飞翔／迁徙／筑巢／啼叫 - insects crawl/fly/bite/sting
昆虫爬／飞／咬／叮 - insects/bees/locusts swarm
昆虫／蜜蜂／蝗虫成群地飞来飞去 - bees collect/gather nectar/pollen
蜜蜂采蜜／花粉 - spiders spin/weave a web
蜘蛛结网／织网 - snakes/lizards shed their skins
蛇／蜥蜴蜕皮 - bears/hedgehogs/frogs hibernate
熊／刺猬／青蛙冬眠 - insect larvae grow/develop/pupate
昆虫的幼虫生长／发育／化蛹 - an egg/a chick/a larva hatches
卵孵化；小鸡出壳；幼虫孵出 - attract/find/choose a mate
吸引／找到／选择配偶 - produce/release eggs/sperm
产卵；排卵；产生／释放精子 - lay/fertilize/incubate/hatch eggs
产卵；使卵受精；孵卵 - inhabit a forest/a reef/the coast
栖居于森林／礁石／海岸 - mark/enter/defend (a) territory
标出／进入／保卫领地 - stalk/hunt/capture/catch/kill prey
悄悄接近／猎杀／捕获／杀死猎物
Plants and fungi 植物和真菌 - trees/plants grow/bloom/blossom/flower
树木／植物生长／开花 - a seed germinates/sprouts
种子发芽 - leaves/buds/roots/shoots appear/develop/form
叶子／花蕾／根茎／幼苗长出来／长大／成形 - flower buds swell/open
花蕾含苞欲放／绽放 - a fungus grows/spreads/colonizes something
菌类生长／扩散／长满… - pollinate/fertilize a flower/plant
给花／植物授粉 - produce/release/spread/disperse pollen/seeds/spores
长出／传播花粉／种子／孢子 - produce/bear fruit
结果 - develop/grow/form roots/shoots/leaves
长出根茎／嫩芽／叶子 - provide/supply/absorb/extract/release nutrients
提供／吸收／提取／释放营养物 - perform/increase/reduce photosynthesis
进行／增加／减少光合作用
Bacteria and viruses 细菌和病毒 - bacteria/microbes/viruses grow/spread/multiply
细菌／微生物／病毒生长／扩散／繁殖 - bacteria/microbes live/thrive in/on something
细菌／微生物在…中存活／大量生长 - bacteria/microbes/viruses evolve/colonize something/cause disease
细菌／微生物／病毒进化／长满…／引发疾病 - bacteria break something down/convert something (into something)
细菌（将某物）分解／转化（成某物） - a virus enters/invades something/the body
病毒进入／侵入某物／身体 - a virus mutates/evolves/replicates (itself)
病毒变异／演化／（自我）复制 - be infected with/contaminated with/exposed to a new strain of a virus/drug-resistant bacteria
感染上／接触到一种新病毒／抗药性细菌 - contain/carry/harbour bacteria/a virus
带有细菌／病毒 - kill/destroy/eliminate harmful/deadly bacteria
杀灭有害的／致命的细菌
Extra ExamplesTopics Plants and treesb1Deciduous trees shed their leaves in autumn. 落叶树木在秋天落叶。 The leaves of this plant are from 1 to 1½ inches in length. 这种植物的叶子长1到1英寸。 He picked a leaf from the basil plant and started to chew it. 他摘下一片罗勒叶子嚼了起来。 In the spring the plant began to put out new leaves. 春天这株植物开始长出新叶。 It was spring and the trees were coming into leaf. 春天来了，树木发芽了。 Spring arrived and the first green leaves began to appear. 春天到了，第一批绿叶开始长出来了。 Stop trying to read tea leaves. 别再试图预测未来了。 The boys helped by raking the leaves in the yard. 男孩们帮忙把院里的树叶耙拢起来。 The corn was already ripening and the trees in full leaf. 玉米已经成熟，树木也已枝繁叶茂。 The ground was thick with dead leaves. 地上积了厚厚的枯叶。 The leaves rustled in the light breeze. 树叶在微风中沙沙作响。 The summer was over and the leaves were beginning to turn. 夏季过去了，叶子开始变黄。 This plant has beautifully variegated leaves. 这种植物的叶子色彩斑斓，非常漂亮。 Throw the tea leaves on the flower bed. 把茶叶撒在花坛上。 broad leaf plants 阔叶植物 dry leaves blowing in the wind 在风中舞动的枯叶 the leaf litter on the forest floor 森林的落叶层
Oxford Collocations Dictionaryadjective- new
- young
- autumn
- …
- have
- come into
- grow
- …
- appear
- emerge
- grow
- …
- litter
- mould/mold
- in full leaf
- -leaf, -leafed, -leaved
(in adjectives 构成形容词 having leaves of the type or number mentioned 有…状叶的；有…片叶的 a four-leaf clover 四叶车轴草 a broad-leaved plant 阔叶植物
- [countable]
a sheet of paper, especially a page in a book （纸）页，张；（尤指书的）页 She carefully turned the leaves of the precious volume. 她小心翼翼地翻动珍贵的书页。
- [uncountable]
metal, especially gold or silver, in the form of very thin sheets 薄金属片；（尤指金或银）箔 gold leaf 金箔
- [countable]
a part of a table that can be lifted up, or an extra section that can be added into the table, in order to make the table bigger 活动桌板；折叠桌板
Word OriginOld English lēaf, of Germanic origin; related to Dutch loof and German Laub.
Idioms
take a leaf from/out of somebody’s book
to copy somebody’s behaviour and do things in the same way that they do, because they are successful 效仿，模仿（成功之人的举止和行为）
turn over a new leaf
to change your way of life to become a better, more responsible person 改恶从善；重新做人