中等
?medium; medium-sized; moderate;middling
?secondary
～城市medium-sized city/～個兒of medium height/～發(fā)達國家moderately developed country/～發(fā)達水平moderately developed/～教育secondary school education/～師范教育secondary normal education/～收入階層middle-income group (or section)/～職業(yè)技術(shù)學校secondary vocational and technical school/～專科學校technical secondary school; polytechnic school/～（中產(chǎn)）階級middle class/～資產(chǎn)階級middle bourgeoisie