有些鱼类能吃掉杂草从而保持湖塘、水道的清洁。中国草鱼即是一例，它能吃掉大量狐尾草之类的长在水面下的杂草。
Some kinds of fish will keep lakes and water-ways clear by eating water weeds. the Chinese grass carp is one. it eats large amounts of water milfoil and other weeds that grow under the water surface.
本文在油源对比的基础上，对三塘湖盆地低熟源岩有机显微组分进行研究，认为盆地主力源岩芦草沟组主要生烃显微组份为腐泥无定型组。
On the basis of oil source correlation, the paper studied the organic microscopic component of the immature hydrocarbon source rock in santanghu basin.
采用稳定塘-植物床系统处理农田排灌水，植物床栽植茭草和芦苇。
The stabilization pond-plant bed composite system was used for treatment of farmland irrigation and drainage water, in the plant bed, Zizania caduciflora and Phragites austrails were planted.
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