Definition: to not know what is happening to someone or something any more Level: B2
我已经不知道我们花了多少钱了。
I've ___lost ___track of how much we've spent.
我们玩得太开心了，以至于忘记了时间。
We were having so much fun that we ___lost ___track of time.
她搬走了，从那以后我就不知道她的情况了。
She moved away, and I've ___lost ___track of her since then.
