Think twice before doing anything rash.
不要草率行事，要三思而行。
Think twice before doing anything
三思而行。
She'd better shut her mouth and from now on think twice before saying stupid things.
她最好闭上嘴巴，而且今后在说出蠢话之前先过过脑子。
You can list them out and think them over.
你可以把它们列出来仔细考虑。
I'd better think over what he said.
我最好仔细考虑他说过的话。
Please think over the meaning of every single word.
请仔细考虑每一个词的意思。
Let's think over the matter first.
首先，对这件事仔细考虑。