1. exposure to 暴露在……之下
The developing organs of a fetus or child are the most likely to be sensitive to any possible effects of exposure to electromagnetic fields.
胎兒或者小孩，正處于發(fā)育狀態(tài)的器官對暴露的電磁場最為敏感0Qy_T|.UoQ%b=!b0qW|s。

2. a major cause of 一個主要原因
The illegal narcotics trade is said to be a major cause of instability in Afghanistan and is believed to be funding Taliban insurgency.
非法毒品貿(mào)易被認(rèn)為是造成阿富汗局勢動蕩的一個主要原因，也被認(rèn)為是塔利班武裝的資金來源Ww=Wg)pEl-。

3. much more likely to 可能性大得多
Employees are much more likely to work to achieve goals when they are easy to understand.
當(dāng)目標(biāo)通俗易懂的時候，員工去為實現(xiàn)它們而努力的可能性就要大得多T9@Sc5Rrb&#b&VLbD。

4. block out 屏蔽
Over the years she had tried to block out that part of her life.
多年來，她一直在努力把她生命中的那一段經(jīng)歷從記憶中抹去7[i^_A#iU_H。