他发明了好几种洁手装置的原型机，这些机器可以悬挂在墙上，跟那种便携式的电动模型一样，大小相当于一支较大的电动牙刷。
He has developed several prototypes of hand-cleaning devices that can be mounted on walls, as well as a portable, battery-operated model the size of a large electric toothbrush.
他发明了好几种洁手装置的原型机，这些机器可以悬挂在墙上，跟那种便携式的电动模型一样，大小相当于一支较大的电动牙刷。
He has developed several prototypes of hand-cleaning devices that can be mounted on walls, as well as a portable, battery-operated model the size of a large electric toothbrush.
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