wind bag

例句：

1. 1. The windbag is a populartoy for children.
   风袋是儿童的热门玩具。
2. 2. The windbag was used tocontrol the sails of the boat.
   风袋被用来控制船帆。
3. 3. The windbagwas blown away by the strong winds.
   风袋被强风吹走了。