This small weakening of the sun, however, has been outpaced by the rapid increase in CO2 levels from all our fossil fuel burning and tree-cutting.

虽然太阳活动降低了，但是我们燃烧化石燃料和砍伐树木引起了CO2的快速升高。

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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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A FOT index is an index that is similar to a B-Tree index, but an FOT index has multiple root nodes and fewer levels. (B-Tree indexes have only one root node and more levels.)

FOT索引类似B - Tree索引，但它有多个根节点和较少的级(B - Tree索引只有一个根节点和更多的级)。

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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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