It depends.
One day a doctor went to a store and bought a pair of shoes. Before he left the shoes counter, he asked the salesgirl: " How long will this pair of shoes last?
"It depends. If you don't use it, the shoes will never wear out."
Several days later the salesgirl fell ill and went to a hospital. And the doctor happened to be the customer she served. After the girl got the prescription from the doctor, she asked: "How soon will I get better with the medicine?"
"It depends. " The doctor answered, "If you don't use it, you will never get better. 　
　　　　　　　　　　看情况而定。
　　　
一天，一位医生到鞋店买了双鞋。他在离开柜台之前，问售货员：“这双鞋能穿多长时间？“
“看情况而定。如果您不穿它，那它们永远也不会坏。”
几天后，这位售货员病了，去医院看病。这位医生碰巧是那位顾客。
当售货员拿了处方后，问道：“吃了这药，我的病多长时间才能好呀？”
“看情况而定。”医生说，“如果你不吃药，你的病永远也好不了。”