特色专题

8月21日,数百万美国人,甚至连总统都暂时放下眼前的事,带上日食眼镜,停下来观看自1918年以来首次横跨美国全境的日食。对于天文学家来说,这次日食是科学界的一大幸事,他们能更轻松地将先进设备对准太阳。


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