“锄禾日当午,汗滴禾下土”。从传统的刀耕火种、牛耕犁耙,再到现代化的机械作业、温室大棚,世世代代脸朝黄土背朝天的庄稼汉做梦也想不到,庄稼竟然会是这么种。时至今日,更想不到的是庄稼竟然可以“长”到天上。如果不信,请看美国的太空农场—— “Hoe Wo day afternoon, sweat Wo soil under the soil.” From the traditional slash-and-burn farming and cattle-harrowing rakes to the modernized mechanical operations and greenhouses, the darlings of descendants of the Loess Plateau who drowned from generation to generation have never dreamed that crops would be such a thing. Today, even more unexpected is that crops can actually “long ” to the sky. If you do not believe, look at the US space farm -