当飞机要起飞时，人们为什么要关掉他们的手机和所有的电子设备呢？
How come people have to turn off their cell phones and all our electronic devices when an airplane is about to take off?
在飞机飞行期间请确保手机关机，起飞前关毕所有其他的电子设备。
Ensure your mobile phone is turned off throughout the flight and all other electronic equipment is off for take off.
飞机起飞和下降时请关闭所有电子设备。
Please keep off all electronic devices during take off and landing.
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