Actually it's harmful to do so.

实际上，这样做是有害的。

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It was harmful to the fields.

它对田地有害。

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People who agreed that environmental smoke was harmful to children's health were more likely to have restrictions on smoking in their homes.

VOA: special.2009.01.07

It's a common bacterium and most strains of E. Coli are not harmful to people, in fact, they provide us with some beneficial properties.

它是常见菌,且大多数种类的菌株对人类无害,实际上还给了我们颇多裨益

耶鲁公开课 - 生物医学工程探索课程节选

when people are behaving in ways that can be harmful to themselves.

当人们在做一些可能会伤害到自己的行为时，

I'm worried 课堂 - SpeakingMax英语口语达人

Every day money managers engage in improper conduct that is harmful to their clients.

FORBES: No Freedom of Information When It Comes to Money Managers (November 1, 2000)

The goal is to identify and quantify conflicts of interest that may be harmful to pensions.

FORBES: SEC Scrutiny of Pension Consultants: A Call To Action (February 28, 2004 )

Lead is known to be harmful to many organs and the central nervous system.

BBC: US rice imports 'contain harmful levels of lead'