照明-这是非常重要的，您给您的鬣蜥获得自然过滤的阳光。
Sun and lighting -it's very important that you give your iguana access to natural unfiltered sunlight.
所以他想弄明白，为什么自然过滤过程未能去除密西西比河的硝酸盐。
So he wondered why that natural filtration process does not remove nitrates from the Mississippi River.
此外，冰岛水源的清澈程度也在世界各国中名列前茅。这是因为该地降水频繁，火山岩还能对水进行自然过滤。
In addition to this, Iceland's water is also among the purest in the world thanks to regular precipitation and the natural filtration of volcanic rock.
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