Professor Biernbaum tried hoop houses on the Student Organic Farm at Michigan State and had success.

VOA: special.2009.12.22

The answer lies in "a universal attribute of instinct and perhaps of organic life in general," that "an instinct is an urge inherent in organic life to restore an earlier state of things."

答案就在本能,或者生命机体中“,他说：，“本能就是生命体与生俱来的,想要回到最初状态的驱动力“

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