如今的绿藻大多生活在淡水水域中，这一点说明它们的早期进化史可能起源于淡水生境。
Today green algae live mainly in freshwater, suggesting that their early evolutionary history may have occurred in freshwater habitats.
与海洋生境不同的是，淡水生境的环境条件变化很大。
The environmental conditions of freshwater habitats, unlike those of ocean habitats, are highly variable.
红树林的树木为鱼类提供了自然的咸淡水生境，但是这些年来在亚齐却恰恰为了修建鱼塘而将红树林砍掉。
Mangrove trees provide a naturally brackish habitat for fish, but much of Aceh's mangroves have been cut down over the years, precisely to build fishponds.
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