Similarly, regulations on vehicle emissions and gas content in the US reduced the volatile compounds in the air and smog levels along with them.
同样,美国关于车辆排放和气体含量的法规降低了空气中的挥发性化合物和烟雾浓度。
单词 | gas content |
例句 |
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TED-Ed(视频版) Similarly, regulations on vehicle emissions and gas content in the US reduced the volatile compounds in the air and smog levels along with them. 同样,美国关于车辆排放和气体含量的法规降低了空气中的挥发性化合物和烟雾浓度。 |
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