In apple trees photosynthesis occurs almostexclusively in the leaves.
苹果树的光合作用几乎只发生在叶内。
3.sustain v. 支撑;支援
The branches could hardly sustain the weight of fruit.
树枝已很难支撑水果的重量。
4.familiar a.对某事物熟悉
You re a new arrival, not too familiar with bern.
你新来乍到,对伯尔尼情况也不太熟悉。
5.scratch v. 抓破;擦伤
The lens is easy to scratch or smudge.
该镜头很容易划伤或弄脏。
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