我走神了。

My attention is taken up to the clouds.

youdao

有一件使我走神的事情，比起前一天的“小心洪水”来不那么让人担心，就是有一只觅食的鸟儿开始围着我打转。

It was a less worrying distraction than the previous day when a bird of prey starting circling around me.

youdao

我老走神，一再回想起我们上次在一起交谈的情景。

My mind kept straying back to our last talk together.

《牛津词典》

I really am just not a fan of the sort of zone-out model of lecture audition.

因为我不喜欢大家,在上课的时候走神。

耶鲁公开课 - 1945年后的美国小说课程节选