Mister Lowell's theories were based on what were serious scientific studies of that time.

VOA: special.2010.07.11

Because you don't know how much more time you've got-- You can make a guess based on statistics, but as we saw, there's wild unpredictability.

因为你不知道你剩下多少时间-,你可以根据数据进行猜测，但是我们都知道，不可预见性太难把握。

耶鲁公开课 - 死亡课程节选

And at the same time it's rigorous, based on research.

同时又是严格的，以研究为基础。

哈佛公开课 - 幸福课课程节选

Part of the American Navy at that time was based in Hong Kong.

VOA: special.2010.07.15

The seven-time winner competed this year on the Astana team based in Kazakhstan.

VOA: special.2009.08.01

One series is based on her time teaching in New Zealand.

VOA: special.2009.11.04

What we're trying to do here is to change the system in the United States from one that is based on the time that is spent in the seat to one that is based on your actual accomplishments."

VOA: special.2010.02.25

And then in terms of providing good information to travelers as to what different travel choices based on real time conditions on the roads.

VOA: standard.2010.07.26

A DNA-based vaccine wouldn't have to be grown in chicken eggs, doing away with the time-consuming and finicky manufacturing process of the current flu vaccine.

VOA: standard.2010.07.21

The G20,which includes major industrialized powers in the Group of Eight plus developing nations with significant economies such as China and India, agreed to a specific time line for deficit reduction, while giving governments flexibility to adjust the pace of changes based on their own situations.

VOA: standard.2010.06.27

He also offered some tough talk. "I emphasized that this has to be a point in time in which we begin to write a new chapter based on improved governance, a much more serious effort to eradicate corruption, joint efforts to accelerate the training of Afghan security forces so that the Afghan people can provide for their own security,".

VOA: standard.2009.11.02