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

我们得听一个关於酗酒的冗长报告!

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

药开始对人没有，但连续服用后果就坏了。

It does no harm to ask.

问一下不会有。

Why, what's the harm?

, 又有什呢?

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成分和吸烟的,呼吁要控制吸烟。