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She had spent years trying to track down her parents.

她已经花了多年试图找到她的父母。

《柯林斯英汉双解大词典》

The police have so far failed to track down the attacker.

警方至今未能追捕到攻击者。

《牛津词典》

In recent days, there have been reports that the Internet search company Google has turned to the U.S.intelligence community to help track down threats to its operations in China.

VOA: standard.2010.02.07

"But our view is, there is still time for diplomacy and,I might say, sanctions to persuade the Iranians that their security will be diminished by going down the track of nuclear weapons."

VOA: standard.2009.09.17

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

BBC: A trip back to your roots

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

FORBES: Retirement With A Purpose

We'll be doing our best to track down that Medfield-powered handset up there, so stay tuned.

ENGADGET: Intel talks Medfield: will ship in a phone and have the longest usage time