上火车时，观察最短的逃离路线，熟悉安全设施，比如紧急报警器和对讲机。

When boarding the train, look for your shortest escape route and familiarize yourself with safety features such as an emergency alarm or intercom.

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一架军用直升机在头顶盘旋，轰鸣的螺旋桨上方，紧急报警器发出悲号。

A military helicopter hovered overhead, its emergency siren howling over the roar of its blades.

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特别需要注意走道变的紧急出口，不要触碰报警器。

Special attention must be paid to the emergency exit on the corridor, don't touch the alarming unit.

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