off the top of one's head片语

片语

1. 1

   不加思索地、凭印象、随口口语

   Off the top of my head, I'd say about thirty people attended.

   凭印象说，大概有三十个人出席。

2. 2

   即兴地、当场想出口语

   He came up with the whole plan off the top of his head.

   整个计划都是他当场想出来的。