提示：点击例句中的单词，就可以看到词义解释

Pin these three pieces together .

用大头针将三部分固定在一起。

Adam smith marvelled at the resulting efficiency in his description of a pin factory .

亚当斯密（adamsmith）在描述大头针工厂时，对分工合作产生的效率感到惊叹。

A safety pin is male - it is often useful in an emergency .

别针是男性：紧急关头总派的上用场。

Caution when handling the sharp pin.why do you think it is important to use something as small as a pin for this ?

当你处理锋利的大头针时要耐心。你觉得为什么使用和大头针一样小的东西来做这个很重要？

Let 's pin the notice on the bulletin board .

咱们把这个通知钉在布告牌上吧。