itwasinAmericantherefor,thatthegreatadvances...
itwasinAmericantherefor,thatthegreatadvancesinnineteenthcenturyagriculturalmachineryfirstcame.请问这句话的意思,
itwasinAmericantherefor,thatthegreatadvances...
itwasinAmericantherefor,thatthegreatadvancesinnineteenthcenturyagriculturalmachineryfirstcame.请问这句话的意思,
因此十九世纪大规模的机械化农业改革是在美国先出现的,
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