1.4.1~1.4.2 第一段翻譯

Pollution is any chemical or physical change in the environment that is harmful to humans or other living organisms.

污染就是任何的化學或物理變化改變了環境，有害於人類或其他生物有機體。

Pollutants can enter the environment naturally, such as from volcanic eruptions, or through human activities, such as burning coal and gasoline.

污染物可以自然的進入環境，如火山爆發，或透過人類的活動，如燃燒煤和汽油。