شبکه واژگان: 有害的

A condition of a person, animal, or plant that is not healthy, such as an infection or a medical problem.

dangerous

The introduction of harmful materials into the environment, such as air, water, or soil. It is a high-frequency topic in academic tests.

An unintended, usually unpleasant, effect of a drug or medical treatment; or a secondary, typically undesirable consequence of an action.