问题
问题是所有引导列试图向左浮动.
when an element is floated it is taken out of the normal flow of the document. It is shifted to the left or right until it touches the edge of its containing box or another floated element.when an element is
阅读背景：
bootstrap列高度_html – 不同高度的Bootstrap流体列列_扔东西瓜皮的博客
来源：互联网
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