second permanent molar造句

例句与造句

1. Sealing the eight first and second permanent molars in the back of the mouth takes about half an hour.
2. The first permanent molars usually come in between ages 5 and 7, the second permanent molars between 11 and 14.
3. It's difficult to find second permanent molar in a sentence. 用second permanent molar造句挺难的