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,又叫,或牙齒,係喺有脊椎動物顎骨上面嘅結構。

牙質地好堅硬,唔同物種嘅牙有唔同形狀、功能。喺同一物種,唔同形狀嘅牙有各種嘅用途。用途包括撕開、磨爛食物。某啲物種,特別係食肉動物,用牙嚟打交、格鬥。有啲物種,據演化論講,用牙嚟吸引異性。

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牙同齒雖則混用咗好耐,然而當初牙同齒有分別嘅。甲骨文字,畫露出上下門牙,而無止字。而金文字,就係上下兩隻大牙交錯扣起,字打橫放,即係臼齒[1][2]

文化

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廣東

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廣東話牙係信用嘅象徵,所有『牙齒當使』,『實牙實齒』,『講口齒』。話人『講大話,甩大牙』。

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睇埋

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