① throw good money after bad 花冤枉钱
to waste money by spending more money on something you have already spent money on that is no good.
例句：
A: Hiring Simon to improve the computer system is throwing good money after bad.
雇用赛蒙来升级电脑系统是在花冤枉钱。
B:Yeah, I agree. It’s based on an older operating system and will soon be obsolete.
这系统使用更老旧的作业系统，很快就会被淘汰。
waste money on：在…上花冤枉钱
be based on:基于
obsolete: adj.淘汰的
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② shop around 货比三家
to look for the most suitable item or service for the lowest price
例句：
A: Have you done buying the gift for our teacher?
你们给老师买好礼物了吗？
B:You don’t need to push us. We want to shop around before buying anything.
你不用催我们，我们买任何东西前，要多转几家商铺。
have you done +doing：你结束（做某事）了吗？
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