Initial production goals in 1980 were 19 tonnes/hectare of maize and 6.7 tonnes of soybean (Flannery, 1982).是什么意思_Initial production goals in 1980 were 19 tonnes/hectare of maize and 6.7 tonnes of soybean (Flannery, 1982).在线翻译_英语_读音_用法_例句