2 sentences

1. 你需要控制自己，三思而后行。

   nǐ xū​yào kòng​zhì zì​jǐ, sān​sī'ér​hòu​xíng.

   You need to control yourself and think before you act.

   Source: OpenSubtitles

2. 也许那时他们会三思而后行。

   yě​xǔ nà​shí tā​men huì sān​sī'ér​hòu​xíng.

   Maybe then they'll think twice.

   Source: OpenSubtitles