名词
中文翻译：线状齿
同义词：
['line', 'ridge', 'tooth', 'ridges例句：1. The linea dentata of the teeth is visible when you smile.（当你微笑时，可以看到牙齿的线状齿。）']
例句：
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1. The linea dentata of the teeth is visible when you smile.
当你微笑时，可以看到牙齿的线状齿。
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2.The ridges on the back of the neck are a sign of old age.
颈部后面的隆起是老年的标志。
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3. The tooth has been chipped and needs to be repaired.
这颗牙被磕断了，需要修复。