They have adopted an academic term, neijuan or " involution" , to describe how extra input no longer yields more output.
他们用了一个学术型术语“卷”形容更多投入并不能带更多产出这一情况。
Sometimes the several-hours after delivery is called the " fourth stage" , because there are major physiologic changes like adaption to the blood loss, and the start of uterine involution, where the uterus begins returning to its pre-pregnant state.
有时分娩后几个小时称为“第四产程”,因为有很多重要生理变化,例如血液流失适应,以及子宫复旧开始,子宫回到产前状态。