Well, make up your mind. Which do you want? This one or that one?

哎，拿定主意。你要哪一个？这个还是那个？

《牛津词典》

You must make up your mind.

你必须下定决心。

youdao

Make up your mind to study harder.

下定决心更加努力地学习。

youdao

All right, I'm going to give you ten seconds fifteen seconds to make up your mind.

差不多打成平手,其他人现在不知道。

麻省理工公开课 - 热力学与动力学课程节选

Or if predestined to die late, Make up your mind to die in state.

或者如果注定要晚点离开世界，那么下定决心离开地庄严一点。

耶鲁公开课 - 现代诗歌课程节选

Some of you here may still be trying to make up your mind.

WHITEHOUSE: Remarks by the President and Vice President in Dayton, OH

Some of you may be still trying to make up your mind.

WHITEHOUSE: Remarks by the President at a Campaign Event, Cleveland, OH

Based on all you know, make up your mind and act.

FORBES: How To Overcome Being Told No