bottom dweller

同根派生

Many species of caddis larva build a protective covering of fine gravel or debris to protect them in this stage.The larva is a bottom dwelling non-swimming stage of the insect.
很多的caddis larva会利用水中的沙砾保护自身（我的理解），larva阶段是（昆虫）在水底孵化时不会游泳的时期。
The water pollution and eutrophication were judged by the assessment of hydrobiology with the species and quantity measure and analysis of phytoplankton,zooplankton,bottom dwelling biology and fish.
水生生物的评价是通过对浮游植物、浮游动物、底栖生物、鱼类种类和数量变化的测定和分析,判定水体的污染和富营养化状况。
They sent the enemy ship to the bottom of the sea.
他们把敌舰击沉。
Let's not dwell on your past mistakes.
我们不要再细说你过去的错误了。
He decided to dwell on our island.
他决定到我们的岛上居住。