Downtonn.唐顿
downadv.向下prep.沿着 ... 而下adj.向下的；消沉的；无礼的n.绒毛；汗毛v.击倒；打败；吞下；被抑制
Downhearted thoughts hinder progress.消沉的思想妨碍进步。
downdraft constant-vacuum carburettor下吸式恒真空度化油器
downhole helical axial gas-liquid pump井下螺旋轴流式气液混抽泵
down-hole bi-directional flow valves井下流体双向流动阀
downlink and uplink synchronization codes上下行同步码
downdraft constant - vacuum carburettor下吸式恒真空度化油器
down-path equivalent system temperature下行线等效系统温度
down L-Wave-band orbit time comparison下行L波段轨道法时间比对
Down-flow anaerobic suspending media bed厌氧悬浮填料床
downlink multiuser multi-antenna systems下行多用户多天线系统
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