A smart housewife was told that there was a kind of stove which would only consume half of the coal she was buming.

一位精明的家庭主妇听说有一种炉子用起来可以比她现在用的炉子省一半的煤。

The buming of the gas produces a large arnount of poisonous gas, which destroys the ozone layer that protects us from the harmful rays.

汽油的燃烧会产生大量的有毒气体，这些有毒气体会破坏保护我们免受有害射线伤害的臭氧层。