1.contribute to 有助于;捐獻
例句:The three sons also contribute to the family business.
這3個兒子也為家族事業做出了貢獻。
2.in principle 從理論上說
例句:The present world crisis should in principle be analysed from different temporal perspectives.
原則上說來,目前的世界危機應該從不同的時間角度加以分析。
3.What if 假如...會怎么樣
例句:What if anything should happen to the child?
萬一這孩子出了差錯怎么辦?
4.in return for 作為...的報答
例句:I'll sell at a discount in return for a speedy sale.
為了盡快售出,我會打折銷售。