人有压力是正常的，但是压力可能是健康的也可能是有危害的。

Stress is normal and can either be healthy or destructive.

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不要把危险物品带到学校，如，刀、火种、以及对身体有危害的东西。

Six, don't bring weapons or dangerous goods like knives, lighters or fireworks to campus.

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说到网上交朋友时，有些人认为它具有很大的优势，而另一些人则认为对人类是有危害的。

When it comes to make friends online, some people think it has great advantages, while others consider it is harm to human beings.

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