近年来污水脱氮主要有以下几种基本方法：物理法、化学法、离子交换法、人工湿地法及生物法，生物法是目前应用最广泛的方法。
There are many ways such as physics, chemistry, ion exchange, man-made wet land and biology etc. wastewater nitrogen removal. The biological way is used widely now.
获取自然环境中的某些部分，再将它们重新组装成湿地或者草原，只是建立生态区的办法之一，生态学家们把这种办法叫做“比对”法。
Constructing a wetlands or savanna by reassembling portions of a natural one is only one method of biome building — which the ecologists call the "analog" way.
之前的Rapanos案，将几个密执安州开发者以及一大片土地卷入其中，并且提出了这样一个问题：与水域相连接的湿地，何时可纳入清洁水法的保护范围。
That matter, known as the Rapanos case, involved a Michigan developer and a large tract of land, and turned on the question of when wetlands are connected to the waters covered by the clean-water law.
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