Residing in the stellar halo extending above and below the galaxy's disk, these stars are so old that they formed before earlier generations of stars had much of a chance to produce heavy elements.

这些古老的恒星居于向银河系圆盘上下延伸的恒星晕之中，它们形成的时间很早，早在有机会产生重元素的前几代恒星形成之前。

youdao

Young people might benefit from early exposure to the Internet for they can start their learning process earlier and get ahead of the game before they start formal schooling.

年轻人较早接触互联网可能会受益，因为他们可以更早地开始学习过程，并在开始接受正规教育之前抢占先机。

youdao

Before we get back to the musical impact of this development, I wanna take a look at the social impact that I mentioned earlier.

在我们回到这一发展对音乐的影响之前，我想先回顾一下我早先提到的社会影响部分。

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The fear is that, as birds move to nesting areas earlier, they will arrive before food is available.

VOA: special.2009.05.12

Pregnant women and people with both HIV and Tuberculosis will receive treatment much earlier than before.

VOA: standard.2009.12.02

Cheshire Police said two men appeared before magistrates earlier this week, charged with burglary.

BBC: GB wheelchair fencer: Police bag discovery "amazing news"

Daschle, surveying the new landscape before him earlier in the day, admitted there are still fundamental disagreements between Democrats and Republicans.

CNN: Democrats settle into power in the Senate

Appearing before MPs earlier this month, Sir Jeremy said there were "some inaccuracies and inconsistencies" in different accounts of the altercation.

BBC: 'Plebgate': MPs rebuke top civil servant over row