So the morning fog, and the dew on your windshield, comes from air that's cooled enough that it can't hang onto its water.

清晨时分的晓雾和挡风玻璃上的晨露即源于此——空气当中的水分冷凝结成的水珠。

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Clear the air. This idiom comes from the fact that, when there is smoke or fog in the air, it is difficult to see.

消除误会。这个习语源于这样一个事实，当空气中烟雾弥漫时，是很难看到东西的。

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When the heavy fog comes, river valleys, the rising clouds, such as dragon head cliff Maxthon in the boundless sea of clouds.

每当大雾袭来，深涧峡谷中，云雾升腾，龙首崖如傲游在茫茫云海之中。

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Come autumn, the fog clears, and this picturesque metropolis by the bay truly comes into its own, with alterna-dudes strutting up and down Valencia Street, skateboards in hand, and venture capitalists making deals from surfboards and road bikes.

WSJ: Journal Concierge: San Francisco