#防止破裂/斷裂 #Prevent fracture/rupture
雌性哺乳類動物的子宮可以擴張和收縮來適應其內容物,這都要歸功於子宮肌層中央的螺旋肌肉纖維 (The uterus of female mammals can expand and contract to accommodate its contents thanks to spiral muscle fibers in its central myometrial layer.)