数字助理已经存在相当一段时间了。

Digital assistants have been ___around for quite some time now.

哲学辩论自苏格拉底时代就已存在。

Philosophical debates have been ___around since the era of Socrates.

在城市地区，可靠的互联网接入总是可用的。

Reliable internet access is always ___around in urban areas.