Morris matched sedentary drivers of London double-deck buses with their physically more active conductors, whose duties required them to continuously go up and down stairs.

Morris教授对比了英国双层巴士久坐不动的驾驶员和不断上下走动，体力消耗较大的售票员。

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Brendan, a junior at the University of Connecticut, sat perched on the double bars of the handrail on the stairs at the top of the park.

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Tosca runs up a flight of stairs into the tower, and then a stunt double leaps from a window and, thanks to a wire, stops in midair.

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The buses round about where I live are almost all double-deckers, and in general the non-smokers sit downstairs whilst the smokers sit up the stairs.

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