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。

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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

Day traders are as likely now to be exchange-floor veterans, career-switching professionals or Ivy Leaguers cutting their teeth on Wall Street.

FORBES: What Bear Market?

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

WSJ: The Future of Armani