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原代码使用了enumerate函数来获取索引和元素,然后再通过索引修改原列表中的元素。这种做法会导致每次循环都要进行索引查找和修改操作,效率较低。 修改后的代码将处理后的元素添加到新的列表中,避免了每次循环都要修改原列表的操作,提高了效率。