在医学上，青春期并不是一个模糊的概念。自20世纪中期以来，儿科和内分泌学界主要通过几类指标来判断青春期的启动时间：女孩乳房发育的起始（thelarche）、阴毛出现，以及第一次月经（初潮，menarche）。这些体征被系统地纳入性成熟评定分期体系（ Tanner ），并长期作为国际通用的临床评估工具。
It also became one of the early examples of user interface design conventions such as badges, rating buttons, sharing and recommendation features which have largely become standard features across media platforms today.
Slight improvement, but effectively useless.，详情可参考爱思助手下载最新版本
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From the outset of the Gorton and Denton byelection, Labour strategists were desperate to say the party was on course to win, but the trouncing at the hands of the Greens has made this look laughable in hindsight.