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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