That may mean safer roads , but it also means a bumpier , less vibrant economy .
这意味着公路比较安全了,但同时也意味着经济之路则更加崎岖不平,缺乏生气。
But the decline is a lot bumpier than the rise : the ph difference from one year to the next is frequently greater than the change in average ph levels over 20 years .
但其下降曲线的振幅却比上升曲线的振幅的大得多:ph值的年际变化常常要比20年平均ph值的变化要大。
Should it disappear , the transition to a multi-currency system would be lengthier and bumpier .