You can easily customize it to show the navigation in a flat list or in a tree hierarchy of varying depth.
您可以轻松对它进行自定义，以在平级列表或在具有不同深度的树层次结构中显示导航。
2
Keep the folder structure to a maximum depth of not more than three levels; otherwise, the navigation becomes cumbersome.
保持文件夹结构的最大深度不超过三层；否则，导航起来会很麻烦。
3
To ensure navigation safety, considering ships need to keep extra depth, the paper proposes the calculations method of tidal level and time of navigation.