He sent the horse forward with a slap on its rump.

他拍了一下马尾,马便向。

Out in the open in the fine snow of Hokkaido cluster the great white cranes, the black tertial plumes of their broad wings arranged over their rumps like elegant bustles.

北海道的旷野上，丹顶鹤群聚柔细的白雪上，双翅上醒目的黑色羽毛优雅地围尾，很像贵妇优雅的裙撑。