Menstruation (a period) is a major stage of puberty in girls; it's one of the many physical signs that a girl is turning into a woman.

月经（例假）的来到是女孩青春期中经历的一个重要阶段；它是女孩变为女人的众多生理变化之一。

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A three-stage life has few transitions, while a multi-stage life has many.

三阶段式的人生少有转折，而多阶段式的人生则有许多转折。

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Ah, stage fright! Many actors have that problem.

啊，怯场！很多演员都有这个问题。

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Hungry for underwriting fees, investment banks rushed many early-stage companies to the bond market even though they faced an overcrowded competitive environment.

FORBES: Wall Street Is Getting Better At Creating 'Junk'

Poor working capital management causes many early-stage companies to fail.

FORBES: Startups, Throw Out Your Financial Models: The Argument For Lean Modeling

They found that detecting and treating many early-stage breast cancers reduced the number of late-stage cancers and deaths only slightly, prompting them to conclude that much of the treatment was unnecessary in some cases because the cancers wouldn't have progressed, and in some cases because they were fatal despite being treated early.

WSJ: Can Breast Cancer Be Overtreated?