downwardadv.向下adj.向下的；下降的downward multiplexing向下多路复用downward infiltration下渗downward delamination下向分层downward acceleration足向加速度, 头向过载downward displacement向下排代Downward gaze of eyes眼下注视Downward core pulling下抽芯downward denomination缩小货币单位<面额>Downward continuation向下延拓downward compatibility反向兼容性,向下兼容性