between +420 and +589) as a device to allow several farmers to work at the same quern .
:到南朝(420-589年)时,又加了连杆,使几个人推动一盘人力磨。
between +420 and +589) as a device to allow several farmers to work at the same quern .
:到南朝(420-589年)时,又加了连杆,使几个人推动一盘人力磨。
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