The PCR method verified in the research have a potentiality to detect D, f and D. p in the environment.

本研究方法具有检测环境中粉尘螨和屋尘螨的潜力。

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In the A, B, C, D and F grading system, the first four letters are typically considered passing grades.

在 A、B、C、D 和 F 评分体系中，前四个字母通常被认为是及格。

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As it does for peanuts and other foods that can cause reactions, the F. D. A. already requires manufacturers to disclose on food labels the presence of artificial colorings.

就如对待花生及其它有可能引起反应的食品一样，食品与药物管理局早就要求生产厂家在食品标签上注明含有人工色素。

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The American Food and Drug Administration says R.F.I.D.tags act like an electronic safety net to make it easier to catch counterfeits.

VOA: special.2010.03.01

f What about 2? d, and 3? Yup, so 3 is f.

嗯，3是。

麻省理工公开课 - 化学原理课程节选

We now live in the internet age and so Regulation F.D.

而我们现在已经进入全新的互联网时代

耶鲁公开课 - 金融市场课程节选

The Islanders also scratched F Marty Reasoner and D Matt Carkner among others ...

WSJ: Penguins drop Islanders 4-0 to regain series lead

"The fact that some airlines have received A's and B's and others D's and F's on this report card also shows that providing decent customer service and avoidance of strandings is both achievable and should not place an undue burden on the airline industry or lead to higher ticket prices, " the report's executive summary said.

CNN: Delta one of top airlines to get an 'F' in report

In the report, Facebook earned poor marks for coal intensity (53.2 percent, the second highest of the 10 companies rated), a D for transparency, an F for infrastructure siting, and a D for mitigation strategy.

FORBES: Facebook Commits to Green Energy -- But Can It Deliver?