higher weak derivative 高阶弱导算子
以上来源于: WordNet
The derivative has weak acidity and is stable in weak base solution.
该衍生物具有弱酸性，在弱碱中稳定。
The results indicate that the derivative 1and 2 have extraction abilities for mercury ion , however the extraction abilities for silver ion are weak.
结果表明，衍生物1、2 对汞离子具有一定的萃取效果，而对银离子萃取效果较差，说明衍生物1、2 对银、汞离子具有一定的选择性萃取作用。
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