track origin [物] 径迹起点
track down the origin 追本溯源
·2,447,543篇论文数据，部分数据来源于NoteExpress
Unlike newspapers though, which are of unknown origin, each track in Undersound will have a birth-place, giving added meaning.
ENGADGET: Undersound, a way to trade music on the London Underground
As you stated, much wood processing is now undertaken in countries from which it is almost impossible to track the honest origin of timber.
ECONOMIST: Conflict of opinion
Law enforcement agencies are "making advances each day" in their ability to track the calls to their origin, Whitmore said.
CNN: Ryan Seacrest's home 'swatted'
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