上管

上梁

to tube───到管子

the tube───伦敦地铁（非正式）；管

to tub───到浴缸

Pitot tube───[流]皮托管（流速计）；皮托静压管

blow tube───n.吹火筒

boob tube───电视机；女式弹力抹胸

glow tube───[电子]辉光放电管

Although the seat is located above the rear sub-frame, it is mounted to the front sub-frame via the square top tube.───虽然座位上方的后方分框架，它是安装在前面的分帧通过广场上管。

Compared to diamond frames, I combined the seat tube and top tube into a single diagonal backbone thereby reducing from 13 joints to 8 joints.───相比，钻石帧，我结合所在地管和上管成一个对角线骨干从而减少了来自13个关节至8节。

Sew two straps to the top of the flap to use for connecting to the top tube of your bike.───缝纫两个背带，以上方的皮瓣用于连接到顶端管你的自行车。

For instance, for a particular rider, it might suggest a 58 cm seat tube with a combined top tube and stem extension of 66 cm.───例如，对于一个特定的骑士，它可能会建议58cm的立管长度，66cm的把立上管总长度。

Process and die design of double-ended spherical-top tube narrowing-mouth───双封闭球头筒缩口工艺与模具设计

Back installed top tube, wider space for training, more save and sciential.