现在人们住的大楼是越盖越高,玻璃窗是越来越高档,可是,不管怎样高档的窗子,都会沾染灰尘。但擦高楼玻璃窗,可能会有危险。因此,我发明了一种安全高楼擦窗机。我找来一根电线杆粗的空心木头,在木头一头的1米处钻个小洞,塞进一根弹簧,在杆子前端放块铁片,紧挨着弹簧。连着弹簧的 Now people living in the building is the higher the cover, the windows are more and more upscale, however, no matter how high-end windows, will be contaminated with dust. But rubbing high-rise windows can be dangerous. Therefore, I invented a safe high-floor gondola machine. I found a thick, hollow pole on the pole, drilled a hole at 1 meter of wood, stuffed a spring, and placed iron in the front of the pole, next to the spring. Attached to the spring