ScienceCasts: 夏日里的蓝月

七月的第二个满月即将到来。按照民间的说法,这是一个 "蓝月"。 更多内容请访问http://science.nasa.gov/。 点击这里查看更多视频:https://alugha.com/NASA 此为2015的视频。

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