weak derivative

基本解释

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。
The blog has already written about weak economics for derivative projects in the Middle East. Could this be a reason for the hesitation on part of the two majors to quickly implement this project?
中东地区衍生项目经济状况薄弱，难道这是两大巨头犹豫不决以致不能尽快实施这个项目？