keep track of
问题描述：
keep track of
最好有例句说明
答
keep track of 记录；追踪；一直清楚(某人或事的)一举一动例:It's hard to keep track of all one's old school friends.I have lost track of some of mine already. 很难保持与所有老同学的联系,我已失去与一些老...