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本公司保留在一定条件下取消这项协议的权利。

The company reserves the right to cancel this agreement in certain circumstances.

《牛津词典》

假如想在一定条件下做一件事情，你需要提问一个问题。

If you want to do something conditionally, you generally need to ask the question.

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So if you wanna do something conditionally, you generally needs to ask the question, is the following true or false.

假如想在一定条件下做一件事情，你需要判断下这个条件，来看看条件是真还是假。

哈佛公开课 - 计算机科学课程节选

And what he said was that when you get down to atomic length scales there are limits, there are constraints on our ability to observe.

讲的就是,当你去进入到原子长度的尺度中,我们的观察能力,有一定的限制条件。

麻省理工公开课 - 固态化学导论课程节选

Because you're going to run it and you'll probably find conditions under which you can run it more or less to completion.

因为如果你想进行这个反应,你总可以找到一定的条件,来或多或少实现这个反应。

麻省理工公开课 - 热力学与动力学课程节选