the digestive tract (= the tube-like passage from the mouth, through the stomach and to the anus, th

中文解释

（尤指胚胎或腔肠动物的）消化道 The opening into the enteron is guarded by a strong muscle called the sphincter. 进入消化道的开口由一种叫做括约肌的强力肌肉把守。