tubular breath sound

例句：

1. 1.The pipes in the wall are all tubular.
   墙上的管道都是圆筒形的。
2. 2. The cylindrical shell of the ship is made of steel.
   船的圆柱形外壳是用钢铁制成的。
3. 3.The tubes inside the machine are tubular.
   机器内部的管子都是圆筒形的。