But while they knew something about sedges and pond frogs , very little of their knowledge was systematically accessible .
尽管他们了解一些莎草和池蛙的情况，但是他们的知识很少是可以系统地加以利用的。
Any of various grasses or sedges having sword-shaped leaves with sharp edges .
叶子呈剑状且边缘锋利的草或莎草。
Any of various sedges of the genus cyperus , especially c. longus of europe , having rough-edged leaves , reddish spikelets , and aromatic roots .
香根莎草一种莎草属莎草，尤指欧洲的长莎草，具有粗糙边缘的叶子、红色的小穗状花和芳香的根部。
Cattail , water grass , spike rush and various sedges established naturally in the wetlands .
香蒲、水草、穗赶往蒲建立和各种自然的湿地.
They mainly eat lichens in winter , especially reindeer moss . However , they also eat the leaves of willows and birches , as well as sedges and grasses .
