短語詞組短語quality backwardness 質(zhì)量追溯backwardness advantage 後發(fā)優(yōu)勢(shì)Not Backwardness 不後退science backwardness 科學(xué)落後relative backwardness 相對(duì)落後Technological Backwardness 技術(shù)落後Curriculum Backwardness 教學(xué)落後method backwardness 手段落後 返回 backwardness