在中国，人们希望晚上关灯一小时。
In China, people expected to keep lights off for one hour at night.
我们不是通过关灯一小时来拯救地球。
We're not saving the planet by turning the lights off for one hour.
30关灯一小时是一件简单易行，容易推广的小事。
Turning your lights off for an hour this Saturday from 8.30pm is a small, simple act that is easy to publicise.
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