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1·Conclusion The time of stages of labor of multipara is shorter obviously than that of primipara.

结论经产妇的产程明显比初产妇短，但随着本次分娩距前次分娩时间的延长，产程也逐渐延长。

2·Outlet obstruction constipation (OOC) is a common disease of females, especially in multipara. Early and accurate diagnosis of the disease is the key to treatment.

出口梗阻性便秘(ooc)是一种女性患者的常见病，尤其多见于经产妇，早期而准确的诊断是治疗的关键。

3·With the extensive use in addition agent of multipara, the arsanilic acid has resulted in remnant in products and environment pollution. So we carry out this research.

由于对氨基苯胂酸广泛用于畜禽饲料添加剂中，不仅对畜禽产品造成残留，而且还对环境带来污染，日益威胁生态环境，为此我们进行了本研究。