lost count

例句：

1. 1. I lost count of the number of times we visited the museum.
   我们参观博物馆的次数数不清。
2. 2. The crowd was so big that it was hard to keep track of everyone.
   人群太多，难以计数。
3. 3.After a long day at work, she felt like she had lost count of all the tasks she needed to complete.
   工作了一整天后，她感觉好像已经数不清需要完成的任务了。