The current is swiftest in the middle of the river.

河当中水流最急。

They have two decades of growing prosperity to point to, certainly the swiftest, most extensive rise out of poverty any nation has seen.

他们会指出中国经历了20年的经济日益繁荣。当然，相对于世界上任何国家来说，也是脱离贫困最快最广泛的国家。

Yet the grouse, although it may swoop and jink to avoid a peppering of pellets, is far from the swiftest bird that might beat a retreat from the shotguns.

尽管松鸡的俯冲和急转可能会躲过子弹网状般的扫射，但它远非速度最迅捷的鸟，能从枪下“漏网”逃生。