| 单词 | air pollution |
| 释义 | air pollutionDefinition The condition in which air is contaminated by foreign substances, or the substances themselves. Air pollution consists of gaseous, liquid, or solid substances that, when present in sufficient concentration, for a sufficient time, and under certain conditions, tend to interfere with human comfort, health or welfare, and cause environmental damage. Air pollution causes acid rain, ozone depletion, photochemical smog, and other such phenomena. Use 'air pollution' in a SentenceIn some larger cities in China, people must wear surgical masks outside because the air pollution there is so bad that it makes breathing difficult. When I traveled around to some third world countries I could always tell how much worse the air pollution was. Air pollution happens when there is an abundance of foreign substances in the air, this happens when there is an abundance of factories releasing harmful gases into the air. |
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