Bt corn can be grown using less pesticide, and sometimes even no pesticide.

Bt玉米在生长过程中需要很少，甚至不需要杀虫剂。

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CIBA Research was the first company to develop what has become commonly known as Bt corn.

CIBA研究所是第一家研制出我们通常所称的Bt玉米的公司。

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When insects bite genetically modified Bt corn and cotton, they get a mouthful of a built-in toxin, produced by every cell of the plant.

当昆虫叮咬基因改造后的Bt菌玉米，他们叮咬的其实是满口的内置毒素，植物的每一个细胞都会产生这样的毒素。

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Bt is used as a pesticide to fight cotton bollworms, corn borers and other pests.

VOA: special.2009.10.27

Other varieties of Bt corn are not known to be harmful to humans.

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Cornell's laboratory research suggests that wind-blown pollen from the Bt corn could disrupt the monarch caterpillar's feeding -- often killing them before they metamorphose from caterpillars to butterflies.

CNN: Researchers find bio-engineered corn harms butterflies

Indeed, Bt corn and other engineered crops have generally drawn rave reviews from farmers and agronomists for increasing crop yields and reducing the need for pesticides and fertilizers.

CNN: Researchers find bio-engineered corn harms butterflies