And sometimes, it is difficult to find a recognizable ancestor of the test object, so the search has to begin from the top-level object, such as a window.

有时，甚至很难找到测试对象可识别的父类，所以搜索必须从最顶层开始，例如从窗口开始。

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The more research we do on more distant species of primates, the better window we have to their common ancestor.

我们对灵长类的远支研究得越多，我们就对它们的始祖了解越多。

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