由玉伯前辈提出，淘宝团队最开始运用，如果把三栏布局比作一只大鸟，可以把main看成是鸟的身体，left和right则是鸟的翅膀。这个布局的实现思路是，先把最重要的身体部分放好，然后再将翅膀移动到适当的地方.
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原文：http://www.cnblogs.com/like-dream/p/7760799.html