Dr Bottke has been tracking the orbits of asteroids.

伯克(Bottke)博士一直在追踪小行星的运行轨迹。

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Mancini has been tracking the versatile left sided player for some time.

曼奇尼一直在跟踪这样的左边路全能球员。

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Michael McCormack is executive director at Shanghai-based research firm Z-Ben Advisors, which has been tracking the Chinese SWFs for years.

迈克尔•麦考马克（Michael McCormack）是上海研究公司咨奔商务咨询（Z-Ben Advisors）的执行董事。

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An International Crisis Group Somalia analyst,Rashid Abdi, says the United States has most probably been tracking the suspect for awhile.

VOA: standard.2009.09.15

There's also another source that has been tracking the performance of the Zweig method.

FORBES: Making Hay With Marty Zweig

Jonathan Spira, chief analyst at research firm Basex , has been tracking the information overload phenomenon for years.

FORBES: Information Overload Makes Us Dazed and Confused

Michael O'Hanlon is a senior fellow at the Brookings Institution who has been tracking the state of the Iraq War since it began.

NPR: Bush Accentuates the Positive in War Speeches