I can only pin it down to between 1936 and 1942.

我只能将其确定在1936年到1942年之间。

《柯林斯英汉双解大词典》

Pin it down through all the layers.

旗杆下，通过所有的层。

youdao

There is a tune going around my head, but I can't pin it down.

我头脑中回荡着一支乐曲旋律，然而我却说不出它出自哪首曲子。

youdao

"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

One of the reasons for thinking it's not clear whether the argument fails or not is because it's hard to pin down, where exactly did it go wrong?

并不能确定这个论证是否成立,的其中一个原因就是,我们很难确定,到底是哪里出了问题

耶鲁公开课 - 死亡课程节选

And I had to spend a lot of time last night trying to pin it down.

WHITEHOUSE: Remarks by the President at a Campaign Event -- Denver, CO

Fully titled "There Ain't No Sweet Man That's Worth the Salt of My Tears, " the track uses the classic disc (also 1928) by Paul Whiteman's Orchestra with Bix Beiderbecke and Bing Crosby as a starting point, with an unmistakably similar two-beat underpinning, a slow grind that makes it impossible to pin it down either rhythmically or chronologically.

WSJ: The Jazz Scene: Easy Keys, Bass Instincts

Without language, culture as we know it wouldn't exist, so scientists are keen to pin down where it sprang from.

WSJ: Study Points to a Single, Original Language for All Humans