wishful thinking
noun [ U ] uk/ˌwɪʃ.fəl ˈθɪŋ.kɪŋ/ us/ˌwɪʃ.fəl ˈθɪŋ.kɪŋ/
如意算盘;痴心妄想
the imagining or discussion of a very unlikely future event or situation as if it were possible and might one day happen
"Do you think you might be in line for promotion?" "No, it's just wishful thinking." “你是否认为自己会获得提升？”“不，那只不过是想入非非而已。”