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 ) 前臼齒（位於人類和一些動物的上下頜兩則，臼齒前緊鄰的兩顆牙齒，用於磨碎、咀嚼、壓碎食物） 返回 premolar