Remember, if gas is turned off, a professional must restore service.
在燃气闸关闭后，必须由专业人员重新打开。
Imagine if the power was turned off for hours on end.
想象一下持续停电几小时。
If we turned off TV an hour, we could climb the mountain together.
如果我们关掉电视一小时，我们可以一起去爬山。
What would happen if the gravity on Earth was suddenly turned off?
如果地球引力突然消失会发生什么情况？
What would happen if the gravity on Earth was suddenly turned off?
如果地球引力突然消失会发生什么情况？
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