What is the main purpose of the safety door?

安全门主要的用途是甚麽?

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However, in the event of an emergency you will be responsible for opening the safety door.

但是, 如果万一发生紧急情况,您将负责开启安全门.

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Technician is sitting on the ground with safety door opening above his shoulder.

员工坐在开着的安全门的下方.

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They patented safety door locks in 1949. - In'51 , they patented front and rear crumple zones.

在1949年他们申请了安全门锁的专利. - 而在51年, 他们的前后冲撞吸收带获得了专利.

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