The level of pollution in the river was falling.
该河流受污染的程度其时正在降低。
Another difficult question involves what level of pollution is safe.
另一个难题是什么样的污染水平是安全的？
It is the information pollution that causes decline of the medical service level.
医疗服务水平下降，其中一个主要原因是医疗服务信息污染。
Each pollution index can reach the air environment quality level-2 standard (GB3095 -1996).
各污染指标可满足环境空气质量(GB3095—1996)中二级标准。
What is the level of competition in the Indian market for air pollution control equipment?
印度的防止大气污染设备市场上的竞争层级？
Air pollution on underground trains tend to be less toxic than that at street level.
地铁里的空气污染应该比街道的毒性弱。
Its advantages are saving energy, high automation level, no pollution and high quality of product.
本发明节约能源，自动化程度高，无污染，生产的产品质量高。
Its advantages are saving energy, high automation level, no pollution and high quality of product.
本发明节约能源，自动化程度高，无污染，生产的产品质量高。
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