从20世纪20年代早期引入商业广播节目开始，这些竞争与合作就在开创美国的广播产业。

Their competition and collaboration were creating the broadcasting industry in the United States, beginning with the introduction of commercial radio programming in the early 1920s.

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在20世纪90年代初期，万维网的开发很大程度上是出于商业目的。

In the early 1990s, the World Wide Web was developed, in large part, for commercial purposes.

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上世纪七八十年代商学院的入学人数激增，使得人们默认任何一个从事商业职业的人都必须进入商学院。

Enrollment in business schools exploded in the 1970s and 1980s and created the assumption that no one who pursued a business career could do without one.

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It was the romantic--and by the way, about 3,300 miles of such canals would be built by the middle of the 1850s, all for the purpose of commerce, and to move people.

顺便说下,这是多么浪漫的事,在五十年代中期,为了商业运输和劳力流通,而建造的这类运河总长达3300英里

耶鲁公开课 - 美国内战与重建课程节选