| 释义 |
乳牙rǔyá人和哺乳动物出生后不久长出来的牙齿。婴儿乳牙在出生后六七个月开始长出门齿,到两岁半长全,共二十个,六至八岁时乳牙开始脱落,换成恒牙。{deciduous tooth; milk tooth; any of the temporary first teeth of a young child or mammal. An infant begins to grow incisor teeth six or seven months after birth. The 20 deciduous teeth are completed at two and a half years of age, and begin to fall off and be replaced by permanent teeth from six to eight.}也叫also乳齿{rǔchǐ},奶牙{nǎiyá}。 |