Some older adults,for example, may not have enough vitamin B-twelve.

VOA: special.2009.04.21

The fall of Pylos is generally thought to be around 1200 B.C.; Mycenae itself may be fifty years later, and other places later than that.

人们普遍认为皮洛斯的陨落,大约在公元前一千二百年,迈锡尼城本身也许在五十年以后,其他的地方更晚些

耶鲁公开课 - 古希腊历史简介课程节选

"Hepatitis B is the silent killer because most people who are chronically infected may not be aware of the infection."

VOA: standard.2010.07.26

If there has been fertilization, Plan B may prevent a fertilized egg from embedding in the uterus.

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The idea that a car is only for getting you from point A to point B may seem just as quaint in few years.

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That's because even if hospital A may charge more than hospital B for a particular service, your insurance company may have negotiated a lower rate with the apparently more expensive hospital.

NPR: 3 min 45 sec