Without an edge, there ain't no tough guy.
没有优势,就不算强悍的人。
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?
For example, an edge might be a contrast between values (the difference between light and dark), colors, textures, or even rhythms (repetition of imagery), without the use of line at all.
例如,边可能是属性值(明暗差异)、颜色、纹理乃至规律(图像反复)的对比,完全与线无关。
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