think twice 三思，慎重考慮
字面含義為「想兩次」，用來表達「慎重考慮」。最常用的結構為 think twice before (在做某事前慎重考慮一番）。與短語 think over 具有相近的含義。
例句：
You should think twice before having kids.
你要在生孩子前好好考慮考慮。
I'm going to think twice before I try this.
我要在開始前好好考慮考慮。
There's always something bugging you. Think hard.
總會有一些事情讓你煩惱，好好想想。
Let me have time to think it over.
讓我找個時間好好想想。
對話：
A: Think twice before you choose what to study.
在你決定學什麼之前，好好考慮考慮。
B: Yeah, you need to get a good education.
恩，你得接受良好的教育。