灭火时消防员们必须互相依靠。

Firefighters have to count on each other during a fire.

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悲观锁定方法的主要问题是事务之间必须互相等待。

The main problem with a pessimistic locking approach is that transactions have to wait for each other.

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悲观锁定方法最主要的问题是，事务之间必须互相等候。

The main problem with a pessimistic approach is that transactions have to wait for each other.

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