By looking at different sediment layers from around the world containing these fossils, they were able to track the spread of this species from its ancestral home to its current distribution.

通过观察来自世界各地含有此类化石的岩层，他们追踪到这一物种的迁徙及其目前的分布情况。

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When this rotating speed ratio is an irrational number, the distribution of grinding track becomes finer.

当转速比为无理数时，研磨轨迹的分布较致密。

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The flow track of liquid drip on packing sheet was also described. This can help the research of liquid distribution in packed bed.

并探讨了液滴在波纹板片上的流动轨迹，有助于对液体在这类填料层内分布作进一步研究。

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Postmen, whose encyclopaedic knowledge of their neighbourhood had long been the backbone of mail distribution, had lost track of their flock during the fighting.

ECONOMIST: Lebanon's postal system

Genesis Energy has established a track record of consistent distribution growth.

FORBES: Get A Steady Flow Of Income From This Oil MLP That's Raised Its Dividend 29 Times In A Row

Wal-Mart uses it to track pallets of diapers and toothpaste in some distribution centers and stores.

FORBES: Magazine Article