One day a doctor went to a store1 and bought a pair of shoes. Before he left the shoes counter2, he asked the salesgirl: How long will this pair of shoes last?
It depends3. If you don t use it, the shoes will never wear out.
Several4 days later5 the salesgirl fell6 ill and went to a hospital. And the happened to be the customer7 she served8. After the girl got9 the prescription10 from the doctor, she asked: How soon will I get better with the medicine11?
It depends. The doctor answered, If you don t use it, you will never get better.
中文：
一天，一位大夫到鞋店买了双鞋。他在离开柜台之前，问售货员：这双鞋能穿多久？
看状况而定。假如你不穿它，那它们永远也不会坏。
几天后，这位售货员病了，去医院看病。这位大夫碰巧是那位客户。
当售货员拿了处方后，问道：吃了这药，我的病多久才能好呀？
看状况而定。大夫说，假如你不吃药，你的病永远也好不了。
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