The enamel surface of human teeth have parallel dimples, with are vertical to the tooth prolate axis

中文解释

人类牙齿的釉质表面有平行排列的与牙长轴垂直的浅凹线纹和不规则的圆形小凹。

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preponderated common average blobbing marqueTEF/TCF常用 暖气 污点 幸运儿 按捺不住 警员 outbreak