It says urinary tract infections increased more than three and a half percent after a surgical operation.

VOA: special.2010.05.25

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

On a 9.6-hectare tract of land . on the Texas coast south of Houston, a start-up company from Florida called Algenol, in partnership with the Dow Chemical company, plans to build more than 3,000 bioreactors,starting next year.

VOA: standard.2009.09.02

This is a picture of the female reproductive tract.

这是一张女性生殖系统的图片

耶鲁公开课 - 生物医学工程探索课程节选