1．娱乐的重要性；
2．怎样科学娱乐。
[写作导航]首先把娱乐和健康联系起来，尤其是大脑，要保持活力就要休息，可引用格言支持；第二段可写娱乐的方式有很多，但科学的娱乐讲究动静结合；第三段举例说明第二段的论点，可举骑车、踢足球、打网球、钓鱼、快步走、下棋等。

[范文]
It is impossible to keep in good health unless we have sufficient recreation. The mind, too, needs rest to keep alert and vigorous. There is a lot of truth in the old saying, "All work and no play makes Jack a dull boy."
There are many games which we can play after our work is done. But it`s always advisable for people to remember that persons who sit much should take up sports or a kind of recreation that requires muscular exercise. Those who spend most of their time in the open air and have constant muscular labor, however, should adopt reading or some other quiet forms of recreation that will give them some physical rest.
Cycling is said to be a capital means of recreation. But some people foolishly exhaust themselves by excessive exertion on the bike. The same may be said in regard to football. Tennis is a great form of recreation. Fishing requires much patience, but there is the risk of catching cold by prolonged exposure. A good brisk walk is one of the finest forms of exercise. For persons engaged in outdoor labor, chess playing is an excellent change.

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