上因特网，在因特网上
to be able to use email or the internet
I'll send you my email address once I'm online. 我一上网就把我的电子邮箱地址发给你。
What proportion of the world's population is online?
The next time I'm online, I'll sign the petition.
His father isn't even online so keeping in touch can be tricky.
Next week I'll be staying on a remote island and I won't be online.
Are you online yet?
See also: online adverb (INTERNET)