kept track of

• v. 掌握(跟上 ... 的进程)

kept track of的用法和样例：

例句

1. It's hard to keep track of (ie maintain contact with) all one's old school friends.
   与中学时的所有老校友都保持联系是很困难的。
2. He reads the newspapers to keep track of current events.
   他阅读报纸以了解时事。
3. We have to keep track of every cent we spend.
   我们得记下我们花的每一分钱。