and they eat nothing but seagrass, mostly the fleshy risomes, which they excavate with their mobile lips. 它们除了海草什么都不吃 他们不停移动嘴唇,把海草的肉质根茎送到口中
although they put out a few ribbon like leaves they produce very extended networks of fleshy stems, risomes, that are buried in the sand. 海草长出叶子状的带状物 以此延伸它们埋在沙子里的肉质根茎.