按锁在家庭使用中常常用到，一般卧室、浴室等会用按锁，当按锁的一边保险按钮未按下，按锁的两边都可以开启，一旦保险按钮按下，房间的另一边就不能再开启。
尺蠖驱动器按锁模机构分类。
Inchworm actuators are classified by the clamping mechanism.
这是一只很滑稽的箱子。一个人只须把它的锁按一下，这箱子就可以飞起来。
It was a very wonderful trunk; no sooner did any one press on the lock than the trunk could fly.
一个线程可以同时持有多个锁，并且可能已经按某种顺序获得了这些锁。
A thread can simultaneously hold more than one lock, and these locks might have been acquired in a certain order.
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