骑自行车对膝盖有好处

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Bicycle riding is a great way to keep fit and healthy. It is good for our heartand our mental1 health. It also helps to keep our weight2 down. It is a little-knownsurprise that bicycle riding is good for our knees. A new study says people oftenriding a bicycle have less knee pain3 when they get older.

骑自行车是保持健康的好方法。（剩余1398字）