顶线是一个汉语词语，读音dǐng xiàn，指风筝的系牵线，约长一、二尺。
n. ceiling ; crest line
misc. apical line
很多字体设计用上升笔划作为大写字母的顶线。
Many designs choose that the ascender line to be their cap line as well.
销售收入。有时也称它为顶线，它是在给定时期内的销售收入总和。
Sales Revenue This is sometimes also called the top Line and is the amount the sold in a given period of time.
在单齿圈破岩试验中，理想的岩样是与牙齿齿顶线相贴合的锥面岩样。
The ideal rock sample is the conical surface rock sample that can joint crest of teeth in single row drilling experiment.
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