辛格和其团队设计出一种使物件收集室内灯光的方式，不仅省电省钱，而且(在某些情况下)可以省去更换电池的麻烦。

Singh and his team designed a way for the gadgets to harvest indoor light, saving energy, money, and (in some cases) the need for replacing batteries.

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居民们为了省钱不用别人说自己就会主动省电，又怎会无端浪费电而增加他们的经济负担呢？

Residents in order to save money without other people say that they will take the initiative to save, how would be gratuitous waste electrical and increase their economic burden?

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