We had to listen to a peroration on the evils of drink!

我们得关於酗酒害处的冗长报告!

At first, the drug does no harm, but cumulatively its effects are bad.

这药开始对人没有害处，但连续服用后果就坏了。

It does no harm to ask.

问下不会有害处。

Why, what's the harm?

嗨, 这又有什么害处呢?

This paper narrated harmful composition in the gaseous state and granulous state of the steam and smoke,and the harm of smoking,appeal control smoking.

本文述说了烟气里气相和粒相中的有害成分和吸烟的害处,呼吁要控制吸烟。