1. electronic tube parameter measurement 
   电子管电参数测量
2. phototube and photomultiplier tube 
   光电管与光电倍增管
3. A high-pitched woodwind instrument consisting of a slender tube closed at one end with keys and finger holes on the side and an opening near the closed end across which the breath is blown. 
   笛由一根一端封闭的纤细管子组成的高音木管乐器，侧边有按键和指孔，靠近封闭端有一个使气流进入的开口
4. An electron tube or a vacuum tube. 
   电子管或真空管
5. electron beam tube display equipment 
   电子束管显示设备

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• 1. 支管
  side-tracking bit侧钻钻头...side-tube支管...sideband clipping边带限制
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