1.reveal v.使显露；展现

He unbuttoned his shirt and revealed a big scar on his chest.
他解开衬衣，露出胸膛上的一个大伤疤。
2.photosynthesis n. 光合作用

In apple trees photosynthesis occurs almost exclusively 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。