历史书中提到,一战期间士兵们经常被毒气攻击。

历史书中提到,一战期间士兵们经常被毒气攻击。

History books mention that soldiers were often gassed during World War I.

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History books mention that soldiers were often gassed during World War I.

### 解释 gassed 是动词 gas 的过去分词形式,在句中表示被动。gas 本意是"气体",在这里特指"毒气",gassed 表示"被毒气攻击"或"遭受毒气袭击"。

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