Pests are those irritating and harmful insects.
害虫就是那些讨厌又有害的昆虫。


Smoking is not only harmful to yourself but also to others.
吸烟不仅对你自己有害，也对别人有害。

N-SING. 臭氧层. The ozone layer is the part of the Earth's atmosphere that has the most ozone in it. The ozone layer protects living things from the harmful radiation of the sun.

Follow the directions carefully, for this medicine may be harmful to your health.

请谨慎地按说明服药，因为这药对你的身体可能有害。