她立下了新年决议，要改善体形。

She made a New Year's resolution to get in shape.

《柯林斯英汉双解大词典》

我必须把我的财务安排好，并立下遗嘱。

I must arrange my financial affairs and make a will.

《牛津词典》

我结婚时立下了誓言而且一直信守诺言。

I took my marriage vows and kept them.

《柯林斯英汉双解大词典》

So, Peter the Great, despite his dramatic expansion of the Russian empire, does not get this outlet on the Black Sea.

所以,彼得大帝,虽然为俄帝国的扩张立下汗马功劳,仍旧没能夺取黑海的入海口

耶鲁公开课 - 欧洲文明课程节选

So I wasn't under a contract but let's come back and fulfill that promise anyway.

虽然我们没立下合同,但是我们以后会回来履行这个承诺的

耶鲁公开课 - 博弈论课程节选

So, I want you to be successful. So, I put this up.

我希望你们成功，所以我立下这点。

麻省理工公开课 - 固态化学导论课程节选