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- 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。
- The child was sitting on the bottom stair. 那孩子正坐在楼梯最下面的一级上。
- I intend to get to the bottom of it. 这件事我打算寻根究底。
- He was always bottom of the class in maths. 他的数学成绩在班上总是垫底。
- The dregs have settled at the bottom of the bottle. 渣滓都沉到瓶底了。
- She did not dwell upon the details of the matter. 她没有多讲事情的细节。
- She did not dwell on the details of the matter. 她没有多讲事情的细节。
- I fell right to the bottom of the stairs. 我从楼梯上一直摔到楼梯下面。
- The police found a body at the bottom of the lake. 警方在湖底发现了一具尸体。
- His bottom waggle in a funny way when he walk. 他走路时臀部扭来扭去，很可笑。
- The bottom of the boat was rusty. 船底生锈了。
- There is a pair of scissors in the bottom drawer. 最底下的抽屉里有把剪刀。
- Prices have reached rock bottom. 价格已经到了最低点。
- Every indication show market get near bottom now. 所有迹象表明，目前市场价格已跌落低谷。
- She knocked the bottom out of our argument. 她把我们的论点驳得体无完肤。
- Her dress flared out towards the bottom. 她的裙子在下摆处呈喇叭状展开。
