心猿意马、头脑的习性是四处游荡。

It is the nature of the mind to roam about.

youdao

不知所云式聆听：你确信正在谈论的主题超过了你的理解范围，于是你起身离开，至少也是心猿意马。

Over-My-Head2 Listening: You are convinced that the subject is beyond you, so you depart, at least in spirit.

youdao

据知情人士称：“哈里目前心猿意马，先要集中注意力去搞他的阿帕奇直升机训练，训练完了他还想回阿富汗。”

An insider said: "Harry has a lot on his mind at the moment." He is concentrating on his Apache helicopter training. After that, he's expecting to return to Afghanistan.

youdao