To solve the ZK3 type turn point machine mechanical jam problem, ZK4 type point machine adopts magnetic lock turn instead of the ZK3 type valve pressure before valves.

为解决ZK 3型转辙机的机械卡阻问题，ZK4型转辙机采用电磁锁闭阀代替了ZK3型的气压锁闭阀。

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I saw Tom put his key in the lock, turn it and open the door.

我看见汤姆把钥匙插进锁里，转动钥匙，打开了门。

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I saw Tom put his key in the lock, turn it and open the door.

我看见汤姆把钥匙插进锁里，转动钥匙，打开了门。

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