But companies are racing to make cleaner, next-generation ethanol from sources including crop waste and rapidly growing non-food crops like and poplar trees.

但是很多公司追求利用农作物废弃物以及生长周期很快的非食用农作物和杨树来生产更为洁净的二代乙醇。

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But companies are racing to make cleaner, next-generation ethanol from sources including crop waste and rapidly growing non-food crops like and poplar trees.

不过现在有很多生产商正试图用作物废料和生长速度很快的软茎黍、杨树等非食用作物来制造更为清洁的新一代乙醇燃料。

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The results indicated that because of trees the temperature, humidity, illuminance under trees in the patterns of poplar-crop are different in monoculture.

研究结果表明： 杨粮间作由于林木的存在，林冠层下农作物面上的温度、湿度、光照强度都不同于单衣经营。

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