剑桥词典one of the two teeth immediately in front of the molars on both sides of the upper and lower jaws of humans and some other animals , used for grinding and chewing food (= crushing it with the teeth ) 前臼齿（位于人类和一些动物的上下颌两则，臼齿前紧邻的两颗牙齿，用于磨碎、咀嚼、压碎食物） 返回 premolar