Theory of quasi-circular-arc gear's shaping is discussed in this paper, and its common tooth-surface equation is developed.

叙述了准端面双圆弧齿轮的形成原理，推导了这种齿轮的通用齿面方程。

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Rather than analyse microscopic cracks in tooth enamel or the chemical composition of bone, as others had done, Strait's team took an approach more common to mechanical engineering.

斯特雷特研究小组采取了一个比机械工程更常见的做法，而不是像别人所做的一样，分析牙齿珐琅质里面的显微裂缝或骨头的化学成分。

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Dreams about hair and tooth loss are also more common in women - perhaps signifying anxieties about losing their looks.

有关掉头发或掉牙的梦在女性的梦境中也更普遍，这可能预示着对容颜逝去的焦虑。

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Tooth decay is a leading chronic childhood disease -- more common than asthma -- and it's almost entirely preventable, according to the Centers for Disease Control and Prevention.

CNN: Baby's teeth: What you should know