The entire universe was, therefore, a nonhabitable zone for perhaps the first few billion years of its 13.7-billion-year history.

在宇宙一百三十七亿年的历史中，大概在前几个十亿年里，整个宇宙都无法让生命生存。

youdao

But the stars in the two galaxies cataloged as NGC 4038 and NGC 4039 don't collide in the course of the ponderous, billion year or so long event.

但在这持续十亿年的事件中，两个编号为NGC 4038和NGC 4039的星系中的恒星没有相撞。

youdao

The prospect of billion-year storage is fascinating and a little terrifying.

数据储存数十亿年的愿景令人着迷却又有点可怕。

youdao

They criticized a proposal for industrialized nations to pay developing countries ten billion dollars a year over three years.

VOA: special.2009.12.12

Same. -Lower Our trade and balance is now about 300 billion a year ? three years from now, higher, lower or the same?

持平，-减少,我国每年的国际收支逆差为3，000亿,3年后，是增加，减少还是持平？

斯坦福公开课 - 经济学课程节选

The amount that we're spending for the year ending June 30,2008 is $843 million -that represents 37% of revenues--and we're projecting expenditures for the following year of $1.15 billion.

截至20008年6月30日,我们的年支出是8亿4千3百万美元,占了收入的37%,我们明年的支出预算是11亿5千万

耶鲁公开课 - 金融市场课程节选

We're giving 50 billion a year in aid to all the developing countries around the world, and we're giving 350 billion a year in subsidies to agricultural producers.

BBC: News | BREAKFAST WITH FROST | President of the World Bank James Wolfensohn

Of course, during most of that 4.5 billion year history, the earth was not populated by intelligent life -- human beings who might have noticed the two events happening on the same day.

CNN: A meteor and asteroid: 1 in 100 million odds

The confirmation, based on analysis of 10 billion year-old dying RR Lyrae stars in the Gemini constellation, was done by an international team of astronomers who report their findings in The Astrophysical Journal.

FORBES: Astronomers Confirm Milky Way's Most Distant Stellar Stream