The processing device used in cone cycloid teeth cutting was studied on the base of studying the theory of nutation engagement.

本课题在进动啮合理论的基础上，研究了锥摆线齿轮的加工装置。

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Why am I supposed to tip the barber for cutting my hair but not the dentist for fixing my teeth?

为什么我应该给为我理发的理发师小费，而不必给为我修牙的牙医小费？

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This week Poland showed its teeth by vetoing moves to set a higher target for cutting EU carbon-dioxide emissions by 2020.

本周，在进一步减少欧盟成员国到2020年二氧化碳排放量的提案中，波兰投了反对票，以示其不愤怒。

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It's a poem on which this very young poet is cutting his teeth.

这首诗让这个年轻的诗人变得成熟。

耶鲁公开课 - 弥尔顿课程节选

The 42-year-old Camerana joined Armani 12 years ago after cutting his teeth in the food industry.

WSJ: The Future of Armani

Mr Hutt said the quality of the latest find was "quite breathtaking" and included teeth preserved with minute cutting edges.

BBC: News | Sci/Tech | New dinosaur discovered in England

The latter song was written three years before Cook's "Idol" run, when he was cutting his teeth as a grass-roots rocker.

CNN: 'Idol' champ eyes long-term success