the corn belt

基本解释

The Corn Belt Debate: Crops Or Cattle?
“玉米带”的争论：种庄稼还是养牛？
Judging from the limited availability of the blend outside the corn belt, few owners of flex-fuel vehicles ever fill up with E85.
考虑到在玉米带（美国的玉米主产区，位于中西部）以外很难有使用E85的加油站，很少有混合燃料汽车的车主会给车加E85。
The same logic applied in the eastern counties of North and South Dakota, in south-west Minnesota and in other parts of the corn belt where getting corn to market is costly.
同样的情形也存在于南北达科达州的东部地区、明尼苏达州西南部地区以及其他处于玉米带中的、将玉米运到市场费用高昂的地方。

But then he flip-flopped in order to obtain electoral support from the Corn Belt.
FORBES: Ethanol Subsidies: Dumping Corn In The Ocean Would Be A Better Idea
For current commercial processes, the highest concentration of biomass is in the Corn Belt states of Iowa, Nebraska and Minnesota.
FORBES: America's Best Places For Alternative Energy
There are an estimated five million flex-fuel vehicles but only about 500 E85 fuel stations and most of those in the corn belt.
NPR: 'Flex-Fuel' Concept Fails to Deliver on Potential

玉米带
It had determinate orderliness for the regional variation of black soil enzyme activities of the corn belt in Jilin. The enzyme activity was the highest in Dehui and Yushu, and it was the lowest in Lishu.
吉林玉米带黑土酶活性的地域性变化具有一定的规律性,以德惠、榆树地区的酶活性为最高,梨树为最低。