In placenta accreta, the placenta invades the myometrium so it doesn't easily separate from the uterus.

当发生胎植入时，胎将侵袭到子宫肌，因此不易从子宫壁上脱离。

Placenta previa is also associated with placenta accreta, which is where the placenta invades the myometrium and becomes inseparable from the uterine wall.

前置胎有时伴有胎生，即胎侵入性生长进子宫肌，无法与子宫壁分离。

The uterus is a muscular organ wrapped by three layers of smooth muscle called the myometrium, which contracts during labor to dilate and efface the cervix and ultimately push out the fetus and placenta.

子宫是一种肌性器官，平滑肌所包裹；这种平滑肌也叫作子宫肌，在分娩过程中收缩，从而缩短子宫颈管、扩大子宫颈口，最终将胎儿和胎娩出体外。

After delivery, the myometrium continues to contract and this squeezes down on the placental arteries at the point where they are attached to the uterine wall, clamping them shut, thereby reducing uterine bleeding.

在分娩之后，子宫肌持续收缩，并将胎动脉挤压到子宫壁上，使动脉生理性结扎，从而减少子宫的出血。