lost the thread of

• v. 乱了头绪(失去线索)

lost the thread of的用法和样例：

例句

用作动词 (v.)

1. The lecturer was not a very clear speaker and I soon missed the thread of his argument.
   演讲人说话不太有条理，不一会我就被他的论点搞乱了头绪。