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你有“后备设施”吗

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一些汽车上有一个后备轮胎,如果有哪个轮胎爆了,可以随时更换;大型喷气式飞机也有后备的机械设备,如果在飞行中出现机械故障的话,马上换用后备设备可以保证继续安全飞行;连球队都有后备队员,看来“后备”在我们的现代生活中真是很重要。

Back-up system 就是指这种后备的设施。我们来看个例子:航天飞机的内部有好多后备的设备来保护宇航员,

On the second day of the flight, the space shuttle's main air-conditioning system broke down. But the astronauts switched on the back-up system and were able to continue the mission for another three days and land safely at Edwards Air Force Base.

在航天飞机起飞后的第二天,飞机里的空调设备坏了。宇航员于是开动了后备的空调设备,这样他们才能再持续工作三天,然后安全地在爱德华兹空军基地降落。

在当前高技术极为普遍的时代,如果没有后备的设施,有的时候非但会影响工作,而且还会造成很大的危险。下面就是一个例子:

This airline pilot talked about getting ready to land that famous day when all the lights in New York went out. He said he was lucky the airport had a back-up system of its own generators -- otherwise he would have to try to land in total darkness.

大家都知道纽约发生停电,全城陷入黑暗的那一天。这个飞行员谈到当天他准备降落的情景。他说,幸运的是,机场自己有后备的发电设备。否则,他得设法在黑暗里降落。"

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