In trawling, a fishing boat drags a bag-shaped net along the sea bottom. Fish such as cod, flounder, and haddock are caught in this way.
用拖网捕鱼时，渔船拖着一个袋状的网，从海底兜网鱼类。鳕、比目鱼、黑线鳕等都是用这种方法捕捞的。
They can buy some modern design products such as glass and porcelain, homemade woolen sweaters, health products such as cod liver oil - keeps you free from illness!
他们可以买一些设计时髦的产品，如玻璃杯和瓷器；家庭自制的羊毛衫；保健产品，如鱼肝油——它可以使你远离疾病！
In 1904 Johannes Schmidt, a young Danish oceanographer and biologist, got a job aboard the Thor, a Danish research vessel, studying the breeding habits of food fishes such as cod and herring.
1904年。年轻的丹麦海洋学家兼生物学家乔纳斯·施密特在丹麦研究船“托尔”号上找到一份工作，研究食用鱼(如鳕鱼和鲱鱼)的繁殖习性。
The most important parameters of wastewater such as COD, colority, turbidity etc, could be decreased efficiently by one step of coagulation.
经过一步强化混凝处理后，各种废水的COD、色度和浊度等均有良好的去除效果。
However, for an accurate simulation of the activated sludge treatment processes, reliable wastewater characteristic parameters such as COD components were needed.
然而，为实现对活性污泥处理过程的准确模拟，需要提供包括COD组分在内的详细的水质特性参数。
However, for an accurate simulation of the activated sludge treatment processes, reliable wastewater characteristic parameters such as COD components were needed.
然而，为实现对活性污泥处理过程的准确模拟，需要提供包括COD组分在内的详细的水质特性参数。
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