Although all 20 primary teeth usually appear by age 3, the pace and order of eruption varies.

虽然20颗乳牙一般全部萌出在3岁左右，但是萌出的步骤和顺序是多种多样的。

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Although all 20 primary teeth usually appear by age 3, the pace and order of eruption varies.

虽然20颗乳牙一般全部萌出在3岁左右，但是萌出的步骤和顺序是多种多样的。

youdao