Biological systems have been doing this for billions of years.

生物系统亿万年来都在这样做。

《柯林斯英汉双解大词典》

The new systems have been optimized for running Microsoft Windows.

新系统已经被优化，以便运行微软视窗系统。

《柯林斯英汉双解大词典》

In the years that have followed, more and more rail systems have been put in, dramatically changing the nature of the city.

在接下来的几年里，越来越多的铁路系统投入使用，从而极大地改变了城市的自然面貌。

youdao

And what I mean by GPS is GPS for the masses, although global positioning systems have been around for quite a while."

VOA: special.2010.12.27

And the cause of some thermodynamics have even been applied to economics, systems out of equilibrium, like big companies like Enron, you know, completely out of equilibrium, crash and burn.

热力学中的一些观点,甚至被应用到经济学中，非平衡态系统，比如像安永那样大公司,彻底偏离平衡态,最后破产了。

麻省理工公开课 - 热力学与动力学课程节选

Other people saying the treatment programs that have been scaled-up over the last number of years have been the best investments in building health systems, while also dealing with the AIDS epidemic, One of the major announcements expected at the 18th International AIDS conference is about a microbicide gel called CAPRISA 004.

VOA: standard.2010.07.15

These systems have been predominantly focused on capturing, accurately storing and visually displaying location information.

FORBES: Location Intelligence - The Future Looks Bright

It appears that new tram systems have been held back by the way they were designed.

BBC: NEWS | UK | Trams: Chic but not cheap

The medical school says similar systems have been used in other parts of Europe.

BBC: Medical school in admissions row