Metronidazole is the drug of choice in pregnancy.

妊娠期感染首选甲硝唑。

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Magnesium sulfate is the drug of choice for seizure prevention.

硫酸镁是预防抽搐的首选药物。

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Obsessive email checks are the drug of choice for most busy professionals.

对于大多数繁忙的专业人士来说，强迫性查看邮件是其首要表现。

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There are other antibiotics that can treat anthrax, but Cipro has become the drug of choice.

FORBES: A New Deal On Cipro

With the invention of the gas-fueled automobile in 1901, black gold became the drug of choice, and its ascent marked the coming of Big Oil.

CNN: The price of our oil addiction

And it's apparently because policing especially in Guinea-Bissau, which is the weakest link, is so poor that these Latin American, South American drug cartels are using this region as a major transit hub to especially traffic cocaine as the drug of choice, and that's on to Europe.

NPR: West African Drug Trade, War of Words in Sudan