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1·He did it with a high tech marvel called a blink comparator; he put two photographs of the same patch of sky taken on different nights into the contraption and flipped back and forth between them.

而这还多亏了一件叫做闪烁对比仪的高科技法宝；他把两张在不同夜晚拍摄的天空中同一位置的照片放在这个仪器里，然后快速地来回浏览。