normal decline fraction 正常递减率
·2,447,543篇论文数据，部分数据来源于NoteExpress
The slow flux decline was mainly caused by neutral hydrophilic fraction of organics with MW between 1 000~10 000, which plugs membrane pore.
相对分子质量在1 000~10 000的中性亲水性有机物，主要通过堵塞膜孔而造成膜通量缓慢下降。
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The lipid fraction did not start to decline until 2 days after planting.
类脂物质直到播后2天才开始下降。
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