These rocks have been dated radiometrically at two billion years old.

经辐射能探测，这些岩石形成于20亿年前。

《牛津词典》

Some two billion people are short of water.

约有20亿人缺少用水。

youdao

More than two billion people are now connected to the Internet.

如今已有超过二十亿人接入互联网。

youdao

Sri Lanka has been seeking a two billion dollar loan from the International Monetary Fund to help its economy.

VOA: special.2009.05.16

Yale now has over twenty-two billion dollars in its endowment.

他缔造了年平均收益率16.1%辉煌绩效 耶鲁现在拥有超过220亿美元的基金

耶鲁公开课 - 金融市场课程节选

re not regulated tightly as ordinary banks would be I believe they have something, they have something like two billion dollar line of credit at the treasury.

他们所受管制，They’,没有普通银行严格,我想他们有，他们有大概20亿元,的授信额度,在财政部。

斯坦福公开课 - 经济学课程节选

Bacteria evolved the necessary chemistry to "fix" nitrogen from the air, about two billion years ago.

BBC: Leaving our mark: Fossils of the future

There are going to be over two billion people to feed across Africa in coming generations.

FORBES: Will African Farmland Yield the Elusive Alpha for Portfolios

Those two billion downloads are the capstone on a massive year for the App store.

FORBES: Apple's App Store Racks Up Two Billion Downloads in December Alone