He?spaced?out?for?a?while_初級英語口語

He spaced out for a while and didn't hear what the teacher was saying.

他一時走神，沒有聽到老師所說的話。

space out是比較口語的說法，意思是一時走神，一時失神。space out 也可指使（人）昏昏沉沉或頭腦不清，如：

That medication totally spaced me out.

那藥物讓我完全神智不清。