例句：
Exercise tones up your body.
運(yùn)動(dòng)強(qiáng)健身體。
Riding a bike is great exercise.
騎自行車是很好的鍛煉。
Swimming is good exercise.
游泳是有益的運(yùn)動(dòng)。
How often do you exercise?
你多長(zhǎng)時(shí)間鍛煉一次？
Swimming is a good form of exercise.
游泳是很好的鍛煉方式。