江河日下;
Bring up a technique way that purified waste water effectively and steadily: in order to improve purify effect,, we decline suspending grain's Surface Zeta electric potential by adding some decontaminant medicine?
提出了污水水质高效净化与稳定的技术思路:通过加入净水剂使悬浮颗粒表面Zeta电位降低来提高净化效果;
the developed world's population is on track to decline steadily from 2025 onwards, according to united nations' projections.
联合国(UN)预计,发达国家人口从2025年起将出现稳步下降的趋势。
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