...中，Adapter有许多不同类型的改变时（同时包含若干数量的remove，add，modify，insert等改变），将会有许多边界情况（edge case）出现。另外，对于一个复杂的LayoutManager，计算一个item将会被放在什么地方并不是一件轻松的事（如StaggeredGridLayout）。
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当然，这里有一些边缘情况(edge case):
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以上来源于: WordNet
What's an edge case?
什么是边界情况呢？
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Listing 4. Testing an edge case: What if someone presses the button without typing in a word?
清单4 .测试一个极端例子：如果有人没有输入单词就按下了按钮该怎么办？
One such edge case was Fighting is Magic, a fan-made 2D beat-em-up in the style of Street Fighter using the cast of Friendship is Magic.
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Even though our initial analysis pointed to this being an edge case and not a widespread problem in our search results, we immediately convened a team that looked carefully at the issue.
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Make sure that the edge of the case around the screen is higher than the screen.
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