oxygen content短语⁹⁰⁸⁸⁷⁺⁷ 基本例句 含氧量 运动 It is true that human activity is causing a steady, measurable decline in the oxygen content of the world's air, although as yet this decline is negligible. 的确,人类的活动导致全球空气中的含氧量在以稳定的,可以测量到的幅度下降。尽管如此,但这种下降是微乎其微的。 yeeyan Plants cull carbon dioxide and increase the oxygen content in air, and some species can filter other harmful gases, such as formaldehyde, as well. 农场中的植物能够吸收二氧化碳,增加空气中的含氧量,而农场中的其他物种则可以过滤空气中的其他有害气体,比如甲醛。 yeeyan