It has taken until now to pin down its exact location.

一直到现在才确定了它的准确位置。

《柯林斯英汉双解大词典》

The cause of the disease is difficult to pin down precisely.

病因目前还难以解释清楚。

《牛津词典》

He set out with an apparently simple aim: to pin down the precise meaning of the concept of "information".

他的出发点显然很简单：确定“信息”这个概念的确切含义。

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"It is very difficult to really pin down and there have been these sorts of accusations from the Revolutionary Guards in the past."

VOA: standard.2009.10.18

That's a quite difficult argument to pin down does it work or does it not work.

这个论证很难确定,是不是说得通。

耶鲁公开课 - 死亡课程节选

You need to pin down an object of study, a first principle from which other principles can emerge, and part of the process is to say, "Hey, it's not literature we're talking about.

首要原则是，需要锁定要谈论，即学习的目标，可是，谁知道什么是文学。

耶鲁公开课 - 文学理论导论课程节选

Investigators also were trying to pin down whether MacInnis and the two women knew each other.

CNN: SHARE THIS

Trading in private shares is growing rapidly, though it's hard to pin down exact numbers.

FORBES: Magazine Article

The stylized action game is actually hard to pin down to a single genre.

FORBES: Connect