That sounds complicated, but isn't really. If you move a light twice as far from your subject, you end up with only one-quarter of the light on the subject.
They use only one-quarter of the electricity to give off the same light.
莹光灯泡只需用四分之一的电力，就能发出同样的亮度。
3
Even sales of Tata Motors' best-selling light commercial vehicles, favoured by small businessmen and farmers, declined by 10 per cent in October, having grown by 19.4 per cent in the third quarter.