Application of half-natural ecological treatment systems which possessing tertial treatment...

三是积中水道技术的研究和应用。

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.

在北海道的旷野上，丹鹤群聚在柔细的白雪上，双翅上醒目的黑色羽毛围在尾部，很像贵妇的裙撑。