dreams or plans that are impossible or unrealistic
不可能または非現実的な夢や計画 (fukanou mata wa hi genjitsuteki na yume ya keikaku)
"He’s always building castles in the air about his future."
"彼はいつも自分の未来についてキャッスルズ イン ザ エアを作り続けています。" (kare wa itsumo jibun no mirai ni tsuite **castles in the air** wo tsukuri tsuzuketeimasu)
to use the same tactics as one’s opponent
to go from being poor to becoming rich and successful
to throw something away
to succeed in maintaining peace after a conflict
something that has great potential to become exceptional
To build a company using only personal finances.
