tertial

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

三是积极开展中水道技术研究和应用。

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.

北海道旷野，丹顶鹤群细白雪，双翅醒色羽毛优雅地围尾部，很像贵妇优雅裙撑。