关键是it指代的是the probability of picking a red marble 还是the probabili
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It指代的是"to pick a blue marble"这件事
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05/03/2014 postreply
10:39:31
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也就是说,这句话可以改写成"and to pick a blue marble is two times as likely"
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05/03/2014 postreply
10:42:32