单词：pin down
pin down的用法和样例：
例句
- 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。
- All work must answer the specifications laid down.全部工作必须符合确定的规格。
- The speaker faces his opponent down.演讲者用目光压住了对手。
- The robbers weighted the box down with stones and dropped it into the river.盗贼们用石头压住箱子，把它沉到河里去了。
词汇搭配
- pin down确定
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