单词：collection efficiency in a photomultiplier tube
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I've got one from Spain，and two from Japan；I've got a couple from Israel and Azerbadjan~~听到开头两句歌词，耳朵就像被叮了一下，好可爱的歌！！旅行的梦想，对世界的想象，原来都偷偷藏在这一张张小小的
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