retention n period 保管期限
retention n of water 水分保持
retention n of afterbirth 胎衣滞留
n retention 氮保留量
The main aim of this thesis is to research the transporting regulation and the retention effect of N and P for the different dimensions pond wetland system.
本论文主要研究在不同尺度条件下水塘湿地系统中氮、磷输移规律及截留效应。
From the N balance trials, it can be inferred that broiler reared under IL have improved DM digestibility andefficancy of dietal N retention.
氮平衡试验表明，IL可提高干物质消化率和氮利用效率。
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