For something so influential and intuitively appealing, it turns out that the Hawthorne effect is remarkably hard to pin down.(作为一个如此具有影响力以及从直觉上引人入胜的理论，“Hawthorne”效应却显得异常难以证实。)
If they can pin down the relationship between age and rotation, a star's age will be much easier to measure.(如果他们能够确定星星年龄与转速之间的关系，星星的年龄测起来就简单的多了。)
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。)
Some expect Apple and Microsoft to Sue Google. Yet this is unlikely, because the online giant will be hard to pin down.(有些人期待苹果和微软起诉谷歌，然而这是不太可能的事情，因为谷歌这个网络巨人是很难被扳倒的。)
The cause of the disease is difficult to pin down precisely.(病因目前还难以解释清楚。)
A trader's intent is hard to pin down, however.(然而，交易商的意向是很难被抑制的。)
Other causes are harder to pin down.(其它原因就很难下定论了。)
I almost knocked the bowling pin down.(我几乎要把这堆保龄球瓶打倒了。)
All carbon footprints are hard or impossible to pin down accurately, but the Internet is a particularly complex case.(所有的碳足迹都很难或者不太可能精确地算出来，对于互联网，情况更是复杂。)
