Suppose I have 2 columns, say c1 and c2, both with width:50%. c1 has 2 nested columns, c1-1 and c1-2, with widths 30% and 70% respectively. Suppose I have 2 columns, say c1 and c2, both w
阅读背景：
在响应式网页设计中，如何确定嵌套列的断点？
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