You made an airscrew for the bonnet at the apply word .

你照着说明书给发动机罩安个螺旋桨。

Betty 's helium-filled aerostat , three metres across , is capable of carrying loads of a little over half a kilo-though for now her power comes from a standard airscrew fitted on a suspended control pod .

betty由氦气填充，直径3米，尽管现在它的动力是来自试装在悬挂控制舱上的传统的螺旋桨，其载重量超过一斤。