Margie even wrote about it that night in her diary. On the page headed May 17, 2157, she wrote, "Today, Tommy found a real book!"headed是过去分词做定语吗?是被标注的意思还是在顶端的意思
Advertising is the largest expense of most marketing plans, with public relations following in a close second and market research not falling far behind.with在这里表示什么意思,在句中做什么成份?