serve-preserve-preservation-reserve-reservoir

serve

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preserve
记忆技巧：pre 预先 + serv 服务；保持 + e → 预先保留 → 保存
Names of people in the book were changed to preserve anonymity.
为了姓名保密，书中的人用的都是化名。  
preservation
Our ultimate goal must be the preservation of the environment.
我们的最终目的必须是环境保护。
The reservoir [ˈrezərvwɑːr]  was low after the long drought.
久旱之后水库的水位下降了。