Obstruction can lead to prolonged labour, which increases the risk of caesarean section, heavy bleeding, distress in the infant and stillbirth.

阻塞可能使分娩时间延长，从而增加剖腹产、大出血、婴儿窘迫和死产的危险。

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Some women also believe, that it is better to avoid a possibly prolonged labour, and the ongoing discomfort of damage caused by the birthing process by having a planned operation instead.

BBC: Big rise in Caesarean births

Scottish Labour has, frankly, vacillated over a prolonged period with regard to the overall method and structure of local government finance.

BBC: Planning for the future

But a prolonged hustings like the Conservatives' leadership race in 2005 would allow a proper debate about the Labour Party's future.

ECONOMIST: Gordon Brown's next six months