preliminary locking

• 初步锁闭

preliminary locking的用法和样例：

例句

1. The car has power steering and a central locking system.
   汽车有动力转向和中枢锁闭系统。
2. The locking snaphook provides the best protection against rollout of the lanyard.
   锁闭式挂钩为防止安全绳脱离提供了最佳的保障。