农业基本上还是靠天吃饭，农业科技如种子等也进步不大，才有了一波又一波的义务修建水利工程，举世瞩目！

来源: jameszon 于 2018-11-06 11:13:45 [博客] [旧帖] [给我悄悄话] 本文已被阅读：次

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