The effects of corn particle size on digestive tract development of young dairy goats were investigated studied by a single-factor completely randomized experiment.

试验采用单因素完全随机试验设计，研究不同玉米粒度对青年奶山羊胃肠道发育的影响。

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Definite development targets shall be specified for tract development and there shall be definite construction projects that are intended to make use of the developed land.

成片开发应确定明确的开发目标，应有明确意向的利用开发后土地的建设项目。

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A vast tract of land is ready for development.

一大片土地正待开发。

《柯林斯英汉双解大词典》

Exposure to phthalates during development can also cause malformations of the male reproductive tract and testicular cancer.

FORBES: Connect

In humans the vocal tract acts as a filter on the sound from the source, and the "source-filter theory" held that the separate, fine control of the vocal tract to be the product of a long evolution in the development of the subtleties of speech.

BBC: Helium-huffing gibbons 'sing with soprano technique'