De Gaulle was a born pedagogue who used the public platform and the television screen to great effect.戴高乐生来喜欢教育人，他充分利用了公共讲坛和电视荧屏。Nothing is more tiresome than a superannuated pedagogue.老朽无能的学究最令人讨厌不过。My friend, because o...
您正在收听的是《科学在行动》，由BBC全球广播频道制作播出。You're listening to Science in Action, brought to you by the BBC World Service.你正在收听的内容来自2039航班上的飞行记录器,也就是人们叫做“黑盒子 ” 的那个东西.This is what you'd call the flight recorder of Flight 203...
而若为肾内肾盂, 肾盏扩张和肾实质损害均严重.In the intrarenal pelvis, caliceal dilatation and renal parenchymal damage are maximal.图中可见巨大的鹿角样结石嵌顿于肾盂肾盏系统.A large staghorn calculus is seen obstructing the renal peli - calyceal system.双肾盂、肾盏及输尿...
研究结果表明,油酸钠是红柱石的最佳捕收剂.Results show that sodium oleate is the best collector for the mineral.研究了红柱石的可浮性及其与捕收剂烷基磺酸盐的作用机理.Study the floatability of andalusite and mechanism of which with alkyl sulphonate as collecter was acc...