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。
The cause of the disease is difficult to pin down precisely.
病因目前还难以解释清楚。
But it is always hard to pin down.
但这始终是难以确切说明。
Mr Obama's views are hard to pin down.
奥巴马先生的观点则很难确定。
Other causes are harder to pin down.
其它原因就很难下定论了。
He is a difficult man to pin down.
他是个不易就范的人。
They can't pin down what is optimal.
他们无法确定哪种才是最佳的情况。
Culture is a difficult concept to pin down.
文化是一个非常难讲清楚的概念。
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。
Our soldiers know how to pin down the enemy.
我们的战士知道如何牵制敌人。
You must pin down every quotation to its author.
你一定要确定每一个引文的作者是谁。
It was difficult for me to pin down the subject.
对我来说，要弄清楚这个问题很困难。
It is difficult to pin down the exact meaning of this word.
很难确定这个词的确切含义。
It is difficult to pin down the exact meaning of this verb.
很难确切解释这个动词的意思。
It is hard to pin down what has been causing honeybees to vanish.
很难确定是什么原因使蜜蜂突然消失。
The police tried to pin down the blame for the fire in the school.
警方设法弄清学校失火的责任。
But it has been difficult to pin down the exact relationships between them.
但要准确定义它们之间的关系还是有困难。
But it took up to now to witness the process in action and pin down the mechanism.
但直到今天才能亲眼目击这一过程并阐明它的机制。
(pin down; guarantee) As the wedding ceremony was approaching, Susan had become quite anxious.
随着婚礼的临近，苏珊变得非常焦虑。
(pin down; guarantee) As the wedding ceremony was approaching, Susan had become quite anxious.
随着婚礼的临近，苏珊变得非常焦虑。
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