If required, add local layer diagrams for the internal structure of each layer.
如果需要，可为每层的内部结构添加本地层关系图。
The referendum litigation institution in German local layer is mature both in theory and practice.
德国地方公民投票诉讼制度在理论和实践上均比较成熟。
The referendum litigation institution in German local layer is mature both in theory and practice.
德国地方公民投票诉讼制度在理论和实践上均比较成熟。
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