Let's catch up onthings, shall we?
I have been absent since last week, I must catch up on things before I really get confused them.
直译：我从上星期就缺席了，我一定要再我真的看不明之前赶上那些东西。
大概的意思：我从上星期就缺席了，我一定要在我真的脱节前学会没学到的东西。
catch up on things 以我个人所知，不是叙叙旧，而是赶上某些东西
Long time no see big chance for us to catch up on things.
We can catch up on things now ,do you think so ?
参考资料：无
Shall we catch up on things for while ?
我们叙叙旧吧.
we haven't talked in a while, how about catching up on thing at lunch?