take it easy: 放松
"Just take it easy," David said. "You'll feel better presently."
“放松点，”戴维说，“你很快就会觉得更舒服些。”

hear from: 接到信
The police are anxious to hear from anyone who may know her.
警方急切地希望任何可能认识她的人打电话来。
Drop us a line, it's always great to hear from you.
给我们写封短信，能收到你的信总是让人很高兴。

lose track of: 失去...的线索
It's so easy to lose track of who's playing who and when.
很容易就忘记谁要和谁比赛，什么时候比。
His mind would wander, and he would lose track of what he was doing.
他会走神，忘了自己正在干什么。