晴朗无云的天空显然为小镇创造了很多财富，小镇也打算设立更多的天文台。
The cloudless sky is clearly a moneymaker for the town, which plans to set up even more observatories.
云量：在晴朗无云的天空，紫外线辐射水平最高。但是，即使有云层，紫外线辐射水平也可以很高。
Cloud cover: UV radiation levels are highest under cloudless skies but even with cloud cover, they can be high.
中东地区的天空非常晴朗，使我们能一览无云的阿拉伯半岛以及伊朗与巴基斯坦群山的景象。
Skies over the Middle East were clear, providing a cloud-free view of Arabian Peninsula and the mountains of Iran and Pakistan.
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