Every American deserves the cleanest air, the safest water, and unpolluted land, and each person can take steps to protect those precious resources.

每一个美国人都应享有最清新的空气、最安全的饮水和未受污染的土地，而且每个人都可以采取措施保护这些宝贵的资源。

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The fashion commentary follows her even on less formal occasions, as when she strides across the South Lawn or steps off Air Force One.

甚至她在跨过白宫南草坪，或是从空军一号下来这样非正式的场合上，对其着装的评论也不曾停歇。

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As the world steps up production, "We have to protect the water and air quality.

随着全球粮食产量的提高，“我们必须保护好水和空气质量。

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Instead, he tossed his precious ball in the air every few steps, catching it with his glove as we walked toward Kenmore Square, on our way home.

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The red carpet reached exactly to the steps of Air Force One.

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The numbers for air pollution are several steps removed from direct measurements.

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