First, if the search does not find the page in the unstable tree, you add a new node in the unstable tree for this page.

第一，如果搜索代码没有在不稳定树中发现页面，则在不稳定树中为该页面添加一个新节点。

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The first step in the unstable tree search is to recalculate the checksum over the page.

在不稳定树中搜索时，第一步是重新计算页面上的校验和。

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Expand selected item (tree views and search results). If the item is already expanded, this will select its first child item.

展开选择的项(树视图和搜索结果)。如果该项已经展开，这将选择它的第一个子项目。

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There's not much more to it than that, and a quick stab at the ignition, a first-time roar from the exhaust and we're off, in search of the Joshua Tree National Park and a little bit of extremeweather testing.

BBC: Trick of the light: A California road trip