It set the clock back on progress by decades.

它使进步的时间倒退了几十年。

In April this year, though, planes carried just 47m passengers; that level of mobility, annualised, would set the clocks back to 1978.

然而，今年4月，飞机载客量只有4700万人次；按年度计算，这样的流动性水平会让时光退回1978年。