n. 刀刃;刀锋;刀片
n. 桨叶;螺旋桨叶;叶片状物
n. 〔草的〕叶片;草叶
rotor blades on a helicopter 直升机的旋翼
The idea was to put blades on the wheels! You know? 把刀片放到车轮上