在过去的四十年，中国种植了数十亿的树木来作为主要遏制北方沙漠延伸的举措之一。

Over the past forty years, China planted billions of trees as part of its fight against expanding deserts, mostly in its north.

youdao

他们有这些特殊的器官来收集硫化氢和二氧化碳，然后把它们转移到另一个器官，那里有数十亿的细菌。

They have these special organs that collect the hydrogen sulfide and carbon dioxide and then transfer it to another organ, where billions of bacteria live.

youdao

想想那数十亿的美元吧。

Billions upon billions of dollars.

youdao

So 2 billion, 4 billion -- these are big numbers, but there's a lot of "billions of things" in the world, right?

所以20亿，40亿--这都是很大的数值，但是世界上有很多“数十亿的东西“，对不？

哈佛公开课 - 计算机科学课程节选

There's billions of atoms.

有数十亿的原子。

哈佛公开课 - 计算机科学课程节选