The Neanderthals lived alongside human ancestors in Europe for tens of thousands of years, before dying out about 40,000 years ago.

尼安德特人与人类祖先一起在欧洲生活了数万年，直到大约4万年前灭绝。

youdao

Planetary nebulae fade away gradually over tens of thousands of years.

行星状星云在数万年间逐渐衰老。

youdao

The mammoth hunting culture appears to have thrived for tens of thousands of years.

数千年来，猛犸狩猎文化似乎繁荣不息。

youdao

They formed little by little tens of thousands of years ago when sea levels dropped.

VOA: special.2010.11.10

These pieces can last for tens of thousands of years.

VOA: special.2009.09.09

In May,Sri Lankan forces soundly defeated the rebel terrorist group, ending 27 years of war that cost tens-of-thousands of lives.

VOA: standard.2009.09.01

Even if we stop emissions now, acidification will last tens of thousands of years.

BBC: Arctic Ocean 'acidifying rapidly'

Here, ancient boulders spring leaks to release water that has been trapped within for tens of thousands of years.

BBC: The perfect trip: New South Wales

Fossil evidence suggests some populations could have been around tens of thousands of years ago, long before the emergence of agriculture.

BBC: Dog evolved 'on the waste dump'