In this sample, the piece of content named Photo Book (shown in figure 10, in the bottom layer of the tree structure) is the default content of the root folder of the library.
在这个示例中，名为Photo Book的内容块(见图10中树结构的底层)是库的根文件夹的默认内容。
The stability of structure and function (photosynthesis production) of the ravine tropical rain forest is maintained by a lot of tree populations, and relative constancy of individuals in each layer.
沟谷热带雨林群落结构和功能(光合生产)的稳定性是以多个物种种群以及各层次中个体数量的相对稳定来维持的。
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