keep informed of fully aware;
"I keep track of the stock market developments"
- I know that the professor will keep track of my attendance but that I will not have to do any papers or take any exam.
- It's hard to keep track of (ie maintain contact with) all one's old school friends.
- He reads the newspapers to keep track of current events.
- We have to keep track of every cent we spend.
- lose track 失去联系