Cotton rapidly became far and away the nation's most valuable commercial crop during the antebellum years.

内战前的几年里，棉花快速成了全国绝对最有价值的经济作物。

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In the centre of the field the wheat is abundant, yielding 10 tonnes a hectare, one of the highest rates in the world for a commercial crop.

试验田中央的小麦确实丰产，每公顷产出10吨，单产率在经济作物领域数一数二。

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AOP is a new technology, and, as such, not all of the current crop of tools are mature enough for commercial development.

AOP是一项新技术，所以，并不是现有的所有工具都已经成熟到适用于商业开发。

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The first successful commercial crop was cultivated in Virginia in 1612 by Englishman John Rolfe.

CNN: A brief history of tobacco

"While small boutiques may want to use old production techniques, we have to operate this as a commercial crop, " says Andrew Floor, Sauza's global brand director.

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Either they are serious about affording the public and our country with the means to counter enemy attacks whether undertaken with fuel trucks, ship-borne containers, commercial airliners, crop-dusters or missiles or they are not.

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