Worrying the area could face the same fate as Niagara Falls, he concluded the site should “be as free as the air or Water.”[22]
由于担心黄石地区可能面临和尼日加拉大瀑布同样的命运，海登下结论说，这个地方应该“像空气或水一样自由。”
To do the job at home, you'll only need a few things: isopropyl alcohol, some purified or bottled water, a lint-free cloth, and some compressed air if you've got some.
在家里就能做这项工作，你仅仅需要一些东西：异丙醇，一些纯将瓶装水，一件不起毛的衣服，和一些压缩空气(如果你能得到的话)。
With almost no heavy industry on South Island, the air, water, and land are all free of pollution.
南岛上几乎没有重工业，空气、水和土地全都未受污染。
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