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That element is itself a list, so the second indexing ([y]) returns one of the nested list's elements.
该元素本身也是一个列表,因此第二个索引操作([y])返回嵌套列表的元素之一。
youdao
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That element is itself a list, so the second indexing ([y]) returns one of the nested list's elements.
该元素本身也是一个列表,因此第二个索引操作([y])返回嵌套列表的元素之一。
youdao