Cotton is a cash crop in the South.

在南方，棉花是经济作物。

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On most American farms, one or two principal products are raised for a cash crop.

在大多数美国农场，有一两种主要农产品是商品作物。

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But wisdom teeth weren't always a cash crop for oral surgeons. Long ago, they served as a useful third set of meat-mashing molars.

很久以前，智齿是作为把肉嚼碎的第三磨牙而派大用处的，不是像现在只是留给口腔医生去拔掉。

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Professor Moseley said Malian farmers had planted more sorghum because the price of their cotton, a cash crop,had dropped.

VOA: special.2010.03.30

Tobacco farmers know there's not a cash crop they can grow that's as lucrative.

CNN: The Tobacco Deal: Smoke And Mirrors?

Besides being a cash crop, it is used as medicine and, as part of tribal culture, smoked on special occasions.

ECONOMIST: An opium ban is a mixed blessing

Over the next two centuries, the growth of tobacco as a cash crop fueled the demand in North America for slave labor.

CNN: A brief history of tobacco