常見例句雙語例句While primary teeth will at one stage be replaced by the permanent teeth, they are very important for several reasons including chewing and speech.而乳牙會在某一堦段改爲(wèi)由恒牙，他們是很重要的原因有幾個，包括咀嚼和講話。At the time of birth, the crowns of the primary teeth (baby teeth) are almost complete and the chewing surfaces of the permanent molars are forming.在出生的時候，第一套牙（乳牙）的牙冠已基本發(fā)育完全，恒磨牙的咀嚼麪也已形成。While primary teeth will at one stage be replaced by the permanent teeth, they are very important for several reasons – including chewing and speech.雖然乳牙會在某一堦段全部更換爲(wèi)恒牙，他們是非常重要的幾個原因，包括檳榔、講話。 返回 primary teeth