A similar project in South America challenged that assumption when it recorded surprise levels of tree growth a decade ago, Lewis said.

在南美洲的一个类似项目挑战了这个假定，它记录了去过十年间树木惊人的成长水平，路易斯说。

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Using a nested table, work items can be displayed in a tree structure, enabling work item levels to be distinguished based on the elements location.

使用固定表，可以将工作项目显示在一个树形结构之中，使得工作项目的层次可以根据元素的位置而有所区分。

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Further simplification is possible; notice how this only simplifies at the bottom levels of the tree?

还可以再进一步简化；注意一下：它是如何实现只简化树的最底层的？

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After public pressure and leadership from a local councilman and the corps' commander, officials at several levels of government created the Los Angeles River Pilot Recreation Zone along a lush segment that features tree-lined islands, vistas of the San Gabriel Mountains and abundant wildlife such as herons, egrets, hawks and kingfishers.

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