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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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。

youdao