用眼睛直接去看太阳对眼睛非常有害，同样的，在电脑前的时间太长了对眼睛也不好。

As you know very well that exposure to sun is very bad for the eyes. Similarly, if you use computer for long hours that also harm your eyes.

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但他们不知道长时间玩电脑游戏对眼睛是有害的。

But they don't know playing computer games for a long time is bad for their eyes.

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但他们不知道长时间玩电脑游戏对眼睛是有害的。

But they don't know playing computer games for a long time is bad for their eyes.

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