pollution level的用法和样例：
例句
- Pollution levels fall during nightime.
夜晚的污染程度则会下降。 - Levels of pollution present in the atmosphere are increasing.
大气中的污染程度正在加深。
pollution level的相关资料：
临近单词
pollution tax
pollution
Pollution permitting system
pollution incident of ships
pollution control technique
pollution emergent accident
pollution of single element
pollution discharge taxation
pollution by nitrogen oxides
pollution monitoring network
pollution control regulation
pollution Tx/Rx isolution
