Researchers compared the use of fertilizer in three areas that grow maize as a major grain: China,Kenya and the United States.

VOA: special.2009.07.28

So you try, if you can grow grain on your land or you grow it where you can, if not, you have to get it elsewhere.

所以你要有一个,如果你的土地适合耕种谷物,或者其它任何可以生产谷物的地方,如果不能,你就必须换个地方了

耶鲁公开课 - 古希腊历史简介课程节选

Vegetables can be grown many times in places where you could never grow wheat or grain.

也许不能生产小麦和谷物的土地,蔬菜却可以长好几季

耶鲁公开课 - 古希腊历史简介课程节选