The anomaly of tooth number is mostly due to hereditary factors.

遗传因素对牙齿数目异常起主导作用。

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This paper advanced a practical and succinct formula for tooth number choice of involute gear.

从等强度概念出发，推出一个据以选取渐开线齿轮齿数的简单、实用公式。

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The design of involute planetary gear pair with a slightly different tooth number of zero restraint is introduced.

文中还介绍了零约束渐开线少齿差行星齿轮传动的机构设计。

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Most serious regulation-watchers would say that anyone who buys that number must also believe in the largess of the Tooth Fairy.

FORBES: Good Riddance To Obama's Regulatory Czar

Dental health experts say tooth decay in children remains too high despite latest figures which show a decrease in the number of five-year-olds with problems.

BBC: Tooth decay in children too high, says chief dental officer