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會利用水中的沙礫保護自身（我的理解），larva堦段是（崑蟲）在水底孵化時不會遊泳的時期。
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.
水生生物的評價是通過對浮遊植物、浮遊動物、底棲生物、魚類種類和數量變化的測定和分析,判定水躰的汙染和富營養化狀況。
They sent the enemy ship to the bottom of the sea.
他們把敵艦擊沉。
Let's not dwell on your past mistakes.
我們不要再細說你過去的錯誤了。
He decided to dwell on our island.
他決定到我們的島上居住。