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