Wheeler said that scientists have not yet studied the yam's nutritional value to see what benefits the plant offers as a food crop.

怀勒说，科学家尚未对这种山药的营养成分及食用益处进行研究。

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Wheeler said scientists have not yet studied the yam's nutritional value to see what benefits the plant offers as a food crop—and despite its popularity, pickings are already slim.

怀勒说，科学家尚未对这种山药的营养成分及食用益处进行研究。 尽管安格那山药深受欢迎，但产量稀少。

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The family has been unable to plant its main sorghum crop, she says, and their buffaloes are becoming “diseased”, a euphemism for starving.

今年，她们家没有办法种植主要的农作物高粱，莎丽拉说到，而且她们家的水牛都“不健康”了--对于挨饿的一种委婉说法。

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If possible, in the year before you plant potatoes, plant a cover crop to improve the soil and the potato production.

VOA: special.2009.03.10

The reason for that is, if you are just engaged in a single crop farming, well you plant it, you take care of it, and then when the times comes you reap it.

其中的原因是,如果只是种庄稼,你先播种,接着你好生照料它们,然后成熟时收割它们

耶鲁公开课 - 古希腊历史简介课程节选

He says you can harvest parsley by cutting most of the plant, or leave more of the plant in the ground for a second crop.

VOA: special.2009.06.02

If a crop or plant is having a bad season and needs pesticide, the community will stop growing it and go without.

BBC: In Oaxaca, a community unchanged

Finally, as our tale draws closer to its conclusion, we find that the residents of the kingdom of Fairyland at Foggy Bottom have now become so fat and lazy that no one wants to work any more, even if there was a way to plant and harvest a crop.

FORBES: Barry's Fairyland at Foggy Bottom

Ernest Girouard Jr. said he was unable to plant a quarter of his crop.

CNN: Severe drought threatens Louisiana coastal marshes