子列表更为精巧：在列表中字符串可以与元组交错，表示混合的内容元素。
The child list is more subtle: Strings can be interleaved with tuples in the list, indicating a mixed content element.
子列表更为精巧：在列表中字符串可以与元组交错，表示混合的内容元素。
The child list is more subtle: Strings can be interleaved with tuples in the list, indicating a mixed content element.
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