假設你是李華，你的朋友John最近沉迷于電腦游戲不能自拔，請你介紹其危害，如：嚴重影響學習和身心健康，并對他的學習生活給出自己的建議，如：多參加運動和社交活動。

注意： 1.詞數(shù)100左右；

2.可以適當增加細節(jié)，以使行文連貫

Dear John,

Yours,

Li Hua

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