警察的职权必须明确界定。

The powers of the police must be clearly defined.

《牛津词典》

若干国家中的传播已不能追踪到明确界定的人际传播链。

Spread in several countries can no longer be traced to clearly-defined chains of human-to-human transmission.

youdao

他们的权利和责任都是有明确界定的-而他们正是在各自的范围内工作。

Their powers and their responsibilities are all clearly defined - and it is within these parameters that they work.

youdao

And so this is not like a math problem set or a physics problem set. Or, like a high school physics lab, where we all know what the answer should be, and you could fake your lab results anyway.

或是物理问题集合,又或者是高中的物理实验室，我们对这些问题都有确切的答案，或者你可以把你的实验结果改成正确的，有些事情是不能明确界定的。

麻省理工公开课 - 计算机科学及编程导论课程节选

All right, so it might be that again, the problem with enforcement, although actually in 1880 America, it's not clear that they couldn't have enforced that contract.

好的,但是我刚才说了强制性的问题,虽然说那是1880年的美国,当时这种合同是否违法没有明确的界定

耶鲁公开课 - 博弈论课程节选

So, for example, in around 1900 in America or a little bit earlier, let's say 1880 in America, it really isn't clear that it was illegal to write agreements to say we'll restrict quantities.

比如1900年甚至更早的美国,假如是1880年的美国吧,在当时这种限制产量的合同是否违法,在司法上没有明确的界定

耶鲁公开课 - 博弈论课程节选