There is a double-layer, hose , and transparent tube , pipe, pipe.
软管有单层、双层，并分透明管、圆管、扁管。
2
Connect the vent hose to the axle shaft tube.
向主动轴管上连接通风管。
3
This seal is normally made by holding the torch flame stationary, blowing out a hole in the main glass body to match a second tube (hose connection in this example).