canvas ventilator

例句：

1. 1. The canvas ventilator is an essential tool for outdoor activities.
   帆布通风器是户外活动必备的工具。
2. 2.The new design of the canvas ventilator has greatly improved its efficiency.
   新型帆布通风器的设计和效率都得到了极大的提升。
3. 3.During the summer, we use the canvas ventilator to cool down the room.
   夏天我们使用帆布通风器来给房间降温。