1.space out ：(因服食毒品而)变得昏昏沉沉,不辨东西南北
2.zone out：
Definition:To lose all concentration; to slip out of normal consciousness,and have nothing on your mind.
定义：完全无法集中精力；心不在焉,头脑一片空白
Example:
举例：
Steven:After working six hours straight,I zoned out in front of my computer screen.
连续工作六小时之后,我在电脑屏幕前头脑一片空白.
Guess you are too tired.I think you need to take a couple of days off.
我猜你是太累了.我认为你该休息几天.
Etymology:A \'zone\' is an area or place.If you \'zone out\',you mentally drift away from the place you are currently,and go off into empty,dreamy space.
词源：“zone”一词是指面积或地方.如果你“zone out”,就是你的头脑游离了你现在所处的位置,而到了一个空空的梦幻空间