Ventilation tube

• 风管

ventilation tube的用法和样例：

例句

1. Tornadoes form when winds blowing in different directions meet in the cloud and begin to turn in circles.Warm air rising from below causes the wind tube to reach toward the ground.
   当云层中不同方向的风相遇且开始环向旋转时就形成龙卷风，低空热气流上升致使这种风管伸向地面。