名词
中文翻译：第二恒磨牙
同义词：
['second molar', "secondary molar例句：1. The dentist removed the primary tooth before the secondary one came in.（牙医在第二颗牙齿长出来之前就把它拔了。）2. The child's primary tooth was so small that it could not be seen clearly.（孩子的第一颗牙齿太小，看不清。）"]
例句：
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1. The dentist removed the primary tooth before the secondary one came in.
牙医在第二颗牙齿长出来之前就把它拔了。
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2. The child's primary tooth was so small that it could not be seen clearly.
孩子的第一颗牙齿太小，看不清。
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3.When a baby teeth falls out, the primary tooth will come in next.
当乳牙脱落时，第一颗牙就会长出来。