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。
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.
你会很难找到什么可抱怨的地方，除非你半夜的时候大吵大闹…或者半夜吃蛋糕！
You'll be hard pushed to find something to complain about here unless you want to be very naughty in the middle of the night... and eat cake!
他们很难找到可替换的。
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