Like anything else, television also has a harmful effect on children.

如同其他事物，电视对孩子也产生不好的影响。

There is abundant evidence that cars have a harmful effect on the environment.

充分的证据表明，汽车对环境有害。

Experts caution that the harmful effect of fog on our health is often concealed.

译文：专家提醒说，雾对人体健康的危害有很大的隐蔽性。

He said that toxic chemicals are having a seriously harmful effect on the human gene pool.

他说有毒化学物质对人类基因库有很严重的危害。

However, only 46% thought that "the benefits of science are greater than any harmful effect".

然而，只有46%的人认为“科学带来的利大于弊。”