I have an expensive computation, the result of which I\'d like to cache. Is there some way to make a map with two keys? I\'m thinking of something like Map<(Thing1, Thing2), Integer>.
map(function,seq[,seq2]) 接收至少两个参数,基本作用为将传入的函数依次作用到序列的每个元素，并且把结果作为新的序列 返回一个可迭代的map对象
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