The scientists asked 200 passersby to estimate the Angle of a set of stairs, and another 200 to do the same for an escalator-which, of course, requires no effort to ascend.
科学家询问了200个行人，让他们评估楼梯的坡度，然后又找了另外200人去评估自动扶梯的坡度——人们总不用攀登自动扶梯了吧。
The invention has good cleaning effect on cleaning the dust at the included Angle of the ground and the wall as well as the dead Angle of the bend Angle of stairs and the like.
本发明对于地面和墙壁夹角，以及楼梯等弯角处死角里的灰尘有很好的清理效果。
The scientists asked 200 passersby to estimate the angle of a set of stairs, and another 200 to do the same for an escalator—which, of course, requires no effort to ascend .
科学家询问了200个行人，让他们评估楼梯的坡度，然后又找了另外200人去评估自动扶梯的坡度——人们总不用攀登自动扶梯了吧。
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