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If you say that an idea, wish, or hope is wishful thinking, you mean that it has failed to come true or is unlikely to come true.
如果你说一个想法、愿望或希望是 wishful thinking 的想法，你的意思是它没有实现或不太可能实现。
A: Do you think you might be in line for promotion?
你是否认为自己会获得提升?
B: No, it's just wishful thinking.
不，那只不过是痴心妄想而已。