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。