Sniffer dogs could be trained to track them down.
可以训练嗅探犬来追捕他们。
It is thought that the train hit a boulder that had fallen down a cliff on to the track.
人们认为这列火车撞到了从悬崖滚到铁轨上的大圆石。
The police have so far failed to track down the attacker.
警方至今未能追捕到攻击者。
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
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