三轮车前面轮胎上双重锁上的铁链生了锈，在骑动的时候发出刺耳的声音。

The rusty iron chain that double-locked the cart to the front wheels of the cycle began to squeal as he rode.

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为了您自身安全，请谨记在客房内锁上双重门锁并在确认访客身份后方可开门。

For your safety, please remember to lock the door with double locks and open the door after confirming the guest's ID.

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