他登上楼梯。
Requirement 1. One fully occupied train*s passengers to exit the train, and ascend the stairs to reach the street access level of the station.
要求1。一个满载乘客的火车,所有乘客都要出火车。所有乘客都要出楼梯抵达出主站台的路上。
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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