长时间看电脑屏幕可能对你的眼睛有害。

Looking at a computer screen for too long can ___be ___bad ___for your eyes.

我不喜欢在电脑上玩，因为它对我的眼睛有害。

I don't like playing on the computer because it ___is ___bad ___for my eyes.

吃太多糖对你的牙齿有害。

Eating too much sugar ___is ___bad ___for your teeth.