Once you become an adult, you are free to make your own decisions.

一旦你变成成年人，你就能自由地自己做决定。

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Once you become a widow and live alone, people are strange toward you.

一旦成为寡妇并独居的时候，人们对你的态度就很奇怪。

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Once you become a "symbol," it's vital that you live up to all expectations.

一旦你变成一种“符号”，符合所有消费者的期望将变得至关重要。

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Once you have registered, if some other slots become available that weren't previously available, I gather you'll be sent some sort of email by the system, in case some other time would be better for you.

一旦你注册了，之前的有些项目,就可用了，系统会用邮件方式向你发送，让你的时间更方便。

耶鲁公开课 - 死亡课程节选

First, the Treaty declared that the individual sovereign state would henceforth become the highest level of authority; you might say, putting an end once and for all " to the universalist claims of the Holy Roman Empire.

第一，条约宣称,各个主权国家,都因此而成为各自国家里最高的权力;,永远终结了,普遍意义上的“神圣罗马帝国。

耶鲁公开课 - 政治哲学导论课程节选

Once you become an adult and you realize that's not true, it's too late.

NPR: Excerpt: 'The Elegance Of The Hedgehog'

Once you become pregnant, your doctor will address gestational diabetes as part of your regular prenatal care.

CNN: Gestational diabetes

But what happens is that once you become a candidate, you have to trim your sails a little bit.

NPR: Slate's Politics: A Political Comeback for Gore?