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一位精明的家庭主妇听说有一种炉子使用时可以比她现在用的炉子省一半的煤。她大为兴奋,说:“那太好了!一个炉子可以省一半的煤,如果我买两个炉子的话,不就可以把煤全都省下来了吗?”
A shrewd housewife heard that there is a stove that can save half the coal it uses when she uses it. She was very excited and said, “That’s great! A stove can save half of the coal. If I buy two stoves, can we not save all the coal?”