# 換言之,實行農業印證了我們稱為自體催化的過程(autocatalystic)──在一個正回饋循環中不斷催化自己的過程;這個過程一旦開展,循環的速度就會越來越快。——《槍炮、病菌與鋼鐵〔25週年暢銷紀念版〕》
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