Saponins have all sorts of physiological activity and become one of hotspots in natural product research. But its complex structure results in the difficulties in its separation.
皂苷具多种生理活性，为目前天然产物研究热点之一，但其结构复杂导致分离工作难度增大，因而也成为研究的难点之一。
Using ammonium carbonate to produce complex fertilizer is one of ways to adjust product structure for small size ammonia plant.
把碳铵加工成复肥，是小氮肥厂调整产品结构的一种选择。
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