手机已经存在多年，是技术快速普及的一个主要例子。

Cell phones ___around for years now are a prime example of rapid technological adoption.

大型体育赛事已经存在了两千多年。

Major sports competitions have been ___around for well over two millennia.

可靠的云存储已经存在了相当长一段时间，使得数据备份变得容易。

Reliable cloud storage has been ___around for quite some time, making data backup easy.