Instead, the panel above your head contains a chemical oxygen generator.

而你头上的盖板有一个氧气泵。

Given the bacteriology and taking into account the chemical oxygen demand, plus we have a bit of tributyl phosphate — not a product I see very often.

考虑到细菌学和化学需氧量，再加上我们发现有一点磷酸三丁酯——这不是我经常看到的产物。

Total emissions of chemical oxygen demand and ammonia nitrogen will see an 8-percent drop, and that of oxynitride and volatile organic compounds will be reduced by more than 10% from 2020 levels, said the plan.

化学需氧量、氨氮、氮氧化物、挥发性有机物排放总量比2020年分别下降8%、8%、10%以上、10%以上。