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1·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》

2·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。

3·Inspired by Halley's suggestion of a way to pin down the scale of the Solar System, teams of British and French astronomers set out on expeditions to places as diverse as India and Siberia.

受哈雷提出的确定太阳系大小的方法启发，英国和法国天文学家团队开始在印度和西伯利亚等地考察。

4·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》

5·Mr Obama's views are hard to pin down.

奥巴马先生的观点则很难确定。

6·But it is always hard to pin down.

但这始终是难以确切说明。

7·Other causes are harder to pin down.

其它原因就很难下定论了。

8·I almost knocked the bowling pin down.

我几乎要把这堆保龄球瓶打倒了。

9·Culture is a difficult concept to pin down.

文化是一个非常难讲清楚的概念。

10·You must pin down every quotation to its author.

你一定要确定每一条引文的作者是谁。

确定

1·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》

2·If his identity is hard to pin down, his fears and hopes are easier to read.

假如他的身份很难确定，那他的担心和希望还是更容易弄懂一些。

3·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。

4·After all, being honest or dishonest involves a set of cognitive and social factors which may prove too complex to pin down.

毕竟诚实与不诚实所涉及的可能是太复杂而难以确定的一系列认知和社会因素。

5·Indeed, the very number of transgender people in the country and the state is hard to pin down.

的确，在整个国家或一个州内变性人的数字很难确定。

阻止

1·But expectations can be difficult to pin down.

但是预期是很难被阻止的。