Keep the default root directory, and ensure that the module group is stable.
保持默认的根目录，并确保模式组是稳定的。
Mobilize all, Seek to the root, Fix in time, and Keep improving.
全体动员，寻求根源，及时处理，持续改进。
Naturally I keep only the reference to the root node of such three.
自然我只能把这三根节点参考。
Naturally I keep only the reference to the root node of such three.
自然我只能把这三根节点参考。
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