学校的停车场上,警报响彻天空。
然而,当我到学校的时候,天空突然乌云密布,而且开始打雷。
However, when I got to school, the sky turned to be gray with the gloomy clouds as well as thunder.
学校的天空依然是不带杂质的蓝,连云彩都很少。
Schools in the sky is still blue without impurities, even the clouds are few.
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