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Dr.Margaret Chan,Director General of the World Health Organization, began a series of daily briefings to track H1N1 as it spread around the globe.

VOA: standard.2009.12.25

Well, first it is important because it's-- you need to track what the population is eating and also individual intake.

说它重要首先是因为,你需要探寻人们都吃什么,还有个体摄入量

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

I could sort of sit there and try to track the lines, but I have to repeat it.

我差不多能试着去跟随旋律线,但必须反复听

耶鲁公开课 - 聆听音乐课程节选

Plan at least six months in advance to track down ancestors and new relatives.

BBC: A trip back to your roots

Consider investing in an inexpensive pedometer to track your movement while on the road.

BBC: Overweight frequent flyers

One way to track down age 55-plus service opportunities is to go to www.getinvolved.gov.

FORBES: Retirement With A Purpose