Translation of "talked" into Chinese

There has been much talk and discussion on the issue of climate change.

关于气候变化问题一直有很多议论和讨论。

Tom is busy now and can't talk with you.

湯姆現在忙,不能跟你講話。

We were talking about something at that time, but I don't remember what.

我们那时在谈论事情,但我不记得是什么了。

We talked in a low voice so as not to be heard.

我们小声谈话以免被人听到。