这是常见的情景(大多数Python程序员不用线程)，锁操作稍微拖慢了解释器。

This is a common situation (most Python programs do not use threads), and the lock operations slow the interpreter down a bit.

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采用挡销式后拖钩，操作方便，并具有自锁功能，在行驶时不会因跳动而发生脱钩，安全可靠；

Rear hitch with spring self-locking device will not come loose when being towed on rough or bumpy road surfaces. both safe and reliable;

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