When ingested, the blood goes through a tract that's adapted for extracting nutrients.

当血液被消化时，它会通过一个为适应排除过量营养素而形成的消化道。

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The size: the house was originally situated on a tract of land measuring approximately 161.919 acres.

规模：这座房子最初建于大约161.919英亩的一大片土地上，这里大部分土地后来被廉价出售；

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The size: the house was originally situated on a tract of land measuring approximately 161.919 acres. Most of this land was sold off at a later date;

规模：这座房子最初建于大约161.919英亩的一大片土地上，这里大部分土地后来被廉价出售；

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But the latest report says urinary tract infections after surgery increased more than three and a half percent.

VOA: special.2010.04.21

A lot has happened since the exuberant optimism of the political spirit that we see in a tract like Areopagitica.

弥尔顿在《论出版自由》中发表了极为乐观的政治思想之后,政治形势发生了很大变化。

耶鲁公开课 - 弥尔顿课程节选

Here Milton is elaborating on the details of his anticipation of his undying fame. This is a polemical tract about a new way in which the Anglican church government should be organized.

在这儿弥尔顿详细的讲述了他对自己,不朽之名的期望，这是一个关于英国国教教会,政府要采取新的组织方式的论辩文。

耶鲁公开课 - 弥尔顿课程节选

The iconic "Colorado Springs, Colorado" (1968), for instance, shows a woman silhouetted in a tract-house window.

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In part, this is because it is a tract for the times.

ECONOMIST: British history

In 1829, he wrote up his ideas about agnosticism in a tract and had a thousand copies printed at his own expense.

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