豹子是非洲草原上奔跑速度最快的动物之一。

___Leopards are one of the fastest running animals on the African savanna.

这位小偷像豹子一样灵活地穿过狭窄的街道，迅速消失在黑暗中。

The thief moved through the narrow streets like a ___leopard, swiftly disappearing into the darkness.