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So Christmas 1925 to New Year's 1926, what did you do for your Christmas vacation?
所以从从1925年得圣诞到1926年的新年，你在圣诞节假期做了什么呢？
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What do you usually do during summer vacation?
你通常在暑假的时候做些什么？
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That is what he did over his Christmas vacation, wave mechanics.
这就是他在他圣诞节假期所做的，波动力学。
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