这时太阳要下山了，突然之间天空变得像被密云覆盖一般黑了下来。
By this time the sun was about to set, and all of a sudden the sky became as dark as if it had been covered with a thick cloud.
这时太阳要下山了，突然之间天空变得像被密云覆盖一般黑了下来。
By this time the sun was about to set, and all of a sudden the sky became as dark as if it had been covered with a thick cloud.
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