Think about it very carefully before you decide.

在你决定之前慎重地考虑。

《柯林斯英汉双解大词典》

I mentioned this before—I think I mentioned it before—if you say, I'm going to ask you to bet on a coin toss.

我之前提到过——我想我之前提到过——如果你说，我想让你赌抛硬币的正反面。

youdao

Before you throw away anything, always think whether it can be reused or not.

在你扔掉任何东西之前，一定要考虑它是否可以被再次使用。

youdao

And I'm going to pause for a minute, before I run it, and ask each of you to compute in your head what you think the answer should be.

我将暂停一会儿，在我运行之前，我想问问你们你们,心算得出的答案应该是什么。

麻省理工公开课 - 计算机科学及编程导论课程节选

I think there's the old saying, "You can't run before you walk." and I think it's basically the same thing about writing.

有句俗话叫，“你不能未立先走。”我觉得写作跟这个是一个道理。

英语阅读：技巧 - SpeakingMax英语口语达人

I mentioned this before -I think I mentioned it before -if you say, I'm going to ask you to bet on a coin toss.

我之前提到过...,应该提到过...,我邀请你与我赌硬币正反面

耶鲁公开课 - 金融市场课程节选

The turn signals are on before you even think about it.

FORBES: Charging electric cars at the Cracker Barrel

If you spot something attached to a cash machine that looks illegitimate, think carefully before you touch it, warned Mr Krebs.

BBC: Has chip and pin had its day?

And when they did find out, do you think that you should have learned about it before you learned about it from news reports as you said last Friday?

WHITEHOUSE: President Obama Holds a Press Conference with Prime Minister Erdogan | The White House