1·This step is necessary because Ajax responses usually need to omit headers, footers, and other extraneous elements that are ordinarily served with the page's main content.
此步骤十分必要，因为Ajax响应通常需要忽略原本充当页面主要内容的页头、页脚和其他外部元素。
2·Note that there's only one user-written function, main , in the whole thing. I start out with a few headers.
请注意此处总体上只有用户编写的一个main函数。
3·We tend to go directly to the main text and forget about headers and footers, where more than one grave error lies in hiding.
我们翻译时常常会直奔正文 忽视页眉和页脚 这里常常隐藏严重的错误。
4·The main source of these failures are vortices existing, in front of Tee-Junctions of entering headers of superheaters and reheaters, caused by the complex flow conditions in the headers.
发生事故的主要原因之一是过热器、再热器进口集箱引入三通处蒸汽在集箱中复杂流动工况下产生涡流，处在涡流区的管屏蒸汽流量减少，使汽温和金属壁温升高。