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1·Bleeding of cesarean section is usually due to uterus atone, placental factors, prolonged labor and lacerated section.

剖宫产出血的主要原因是宫缩乏力、胎盘因素、产程延长及切口撕裂等。

2·The fast-food chain has refused to sign labor contracts or insure employees against workplace injuries, and prolonged their probationary periods.

该快餐连锁拒绝签订劳动合同、缴纳工伤保险，并且延长了试用期。

3·If prolonged, obstructed labor often kills the baby, which may then soften enough to fit through the pelvis, so that the mother delivers a corpse.

如果时间延迟，分娩受阻常导致胎儿死亡，胎儿软化后才能穿过盆腔，所以，生出来的也是死婴。

4·Because of the simple operation and no requirements for a large quantity of manpower, materials, and labor, the service life of the hose is prolonged.

由于上述操作简单，不必投入大量人力、物力和大量的劳动，延长了胶管的使用寿命。