I go swimming every day in order to keep fit.
我每天游泳以保持健康。
If it doesn't fit, you can always take it back.
要是它不合适，你总还可以把它退回去嘛。
Fit people are better able to cope with stress.
健康的人较能应付压力。
She still has a long way to go before she's fully fit.
她还需要很长时间才能完全恢复健康。
Well, I suppose I could fit you in at 3.45.
好吧，我想可以在3:45见你。