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来源:雅诚德英语网
Halley realised that Mercury was so far away that its parallax angle would be very difficult to determine.
哈雷意识到水星离地球如此之远,以至于很难确定它的视差角。
Halley realised that Mercury was so far away that its parallax angle would be very difficult to determine.
哈雷意识到水星离地球如此之远,以至于很难确定它的视差角。