【句子对照】
He is just a space cadet; you see his dreams have never come true.他只爱幻想，却不付诸于实际行动。他的梦想从来没有实现过。
【关键俚语】
space cadet 英：Someone who is generally unaware, or not paying attention, or out of touch with reality 中：想入非非的人：