按倒葫芦起了瓢，嗯?q蓄的功效。这就是环境治理的窘境。

PS.

二次翻译自 Secondary, 对应的是一次排放 Primary?q蓄的功效。“二次”翻译得不准确也不够严谨。比如上边的这个例子，要是有好几步反应，算是几次污染物呢？所以翻译成“次生”相对来说要好一些。

参考：

Y. Zhang, A.J. Dore, L. Ma, X.J. Liu, W.Q. Ma, J.N. Cape, F.S. Zhang. Agricultural ammonia emissions inventory and spatial distribution in the North China Plain Environ. Pollut. 158 (2010) 490–501.

Clarisse, L., Clerbaux, C., Dentener, F., Hurtmans, D., and Coheur, P. F.: Global ammonia distribution derived from infrared satellite observations, Nature Geosci., 2, 478–483,doi:10.1038/NGEO551, 2009.

Zhang, Q., Meng, J., Quan, J., Gao, Y., Zhao, D., Chen, P., and He, H.: Impact of aerosol composition on cloud condensation nuclei activity, Atmospheric Chemistry and Physics, 12, 3783-3790, 2012.