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1. in turn

大多數同學會理解為 “反過來”，認為前后語義是對立的，但實際上閱讀中也可能表示順接關系，翻譯為“接著會…（發生）…”

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

大家背四級單詞時更多的理解為 “（比例上）占…”的含義，實際上account for還有“解釋，說明……”這個意思。

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.