That makes it the biggest known crater in our solar system and it may well be the oldest.

这使它成为太阳系中已知最大的陨石坑，也可能是最古老的陨石坑。

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Astronomers know the system has been around for a while because the oldest stars in a few of its ancient globular clusters are about 10 billion years old.

由于其中最古老的球状星团中最古老的成员星年龄有100亿年，天文学家知道，这一系统已经相聚很久了。

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One of the oldest version-control packages around is the Concurrent Versioning System (CVS).

Concurrent Versioning System (CVS)是最早的版本控制包之一。

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The London Underground, known as the Tube, opened in 1863, making it the oldest underground system in the world, and this year, a series of celebrations are planned for its 150th anniversary.

BBC: Living in: Great cities for public transport

Proto-Elamite is the oldest known undeciphered writing system.

ENGADGET: Alt-week 27.10.12: ancient texts, super-Earths and special-ops mice

The Beijing Subway system, the country's oldest, is undergoing an unprecedented expansion ahead of the Summer Olympics.

CNN: Beijing commuters feel the squeeze