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1. in turn

大多数同学会理解为 “反过来”，认为前后语义是对立的，但实际上阅读中也可能表示顺接关系，翻译为“接着会…（发生）…”

The conventional theory is that people yawn when bored or sleepy because yawning raises blood oxygen levels, which in turn raises alertness.

2. account for

大家背四级单词时更多的理解为 “（比例上）占…”的含义，实际上account for还有“解释，说明……”这个意思。

Heavy rain accounts for most of the water that enters into lakes.

Scientists will not be able to account for climate changeover the past century until they learn more about the urban heat island.

3. precipitation

这是个话题词汇，大多数文章中翻译为 “沉淀”，不过也有“降水”的意思。

Ordinary meteoric water is water that has soaked into the ground from the surface, from precipitation （rain and snow） and from lakes and streams.