Objective To couple folate with chitosan and prepare folate-coupled chitosan by different connection ratio.
目的 叶酸与壳聚糖偶联，并制备不同连接比例的叶酸偶联壳聚糖。
The connection between the ratio of males to females and savings levels is simple.
男女比例与储蓄率之间的关联很简单。
However, a recent study found no connection between a mother's waist-to-hip ratio and her infant's gender.
不过最近的一项研究表明，母亲的腰、臀比例和婴儿的性别没有关系。
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