Please sign on the top line.

请在头一行签名。

Please read the top line of the page.

请读这一页的第一行。

Advertising is only 6% of the company's top line now.

广告收入仅占腾讯目前总收入的6%。

In Figure 2, the top line shows the number of processors.

图2中最上面的一条线显示了处理器的数目。

Yet top line periodicals have yet to publish even one article.

然而顶级的期刊还需要出版哪怕一篇文章。