High thin clouds are very transparent to solar radiation, like clear air.

太阳辐射可以轻易地通过高空薄云层，就像通过空气一样。

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The scene has steep peaks, gurgling springs, shadow fruits, overflow flowers and grasses and clear air.

景区内山峰陡峭，泉水淙淙，果林成荫，花草弥坡，空气清新。

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I live in a place with clear air.

我住在一个有着清新空气的地方。

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"Our study showed for the first time a clear difference between oxygen and air in the treatment of acute cluster headache.

VOA: standard.2009.12.17

He said a lot of misinformation is being spread by critics of reform, adding that it is necessary to clear the air.

VOA: standard.2009.08.11

"Twenty percent of attacks were improved on placebo,which is air, and 78 percent of attacks were improved on oxygen, a clear difference in favor of oxygen,"

VOA: standard.2009.12.17

On the count of three, he said, we would just roll out into the cold, clear air.

WSJ: Sky-Diving in New Zealand

Kaiser believes, however, that the terminology in the public debate on clear air standards will have to change to accomplish these goals.

FORBES: Billionaire George Kaiser Has A Big Green Energy Plan

They found that gravity waves "break" on the surfaces of planes, just like ocean waves breaking on the beach, causing much of the turbulence that occurs out of the blue in clear air.

MSN: Blame gravity waves for turbulence - Technology & science - Science - LiveScience | NBC News