The impact of changing the light bulbs in any given household may be puny, but it saves money and it makes an easy, if small contribution to cutting emissions.
在任何一个家庭，换灯泡的作用或许微不足道，但它节省开支，而且为减少排放作出了唾手可得的小小贡献。
The impact of changing the light bulbs in any given household may be puny, but it saves money and it makes an easy, if small contribution to cutting emissions.
在任何一个家庭，换灯泡的作用或许微不足道，但它节省开支，而且为减少排放作出了唾手可得的小小贡献。
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