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lat的值是(mashed potatoes and meat gravy),((null? lat) #f)是什么意思?
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潘飞
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Jun 9, 2011, 2:09:47 AM
6/9/11
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(null? lat)询问lat是否是空列表。如果是,这个值就是#f,因为meat还没有找到。如果不是,我们询问下一个问题。这里,它不是空,所以我们询问下一个问题。
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