The default grid system provided in Bootstrap utilizes 12 columns that render out at widths of 724px, 940px (default without responsive CSS included), and 1170px. Below 767px viewports, the columns become fluid and stack vertically.
从美国经验来看 ，人均GDP达到7000美元左右，文化娱乐消费就会快速兴起 。 这一句句让人驻足的文案 ，均来自网易云音乐的乐评。