as flat as an airport runway
平得如機場跑道。。。哈哈哈。“長平公主而已”---你知道是什麽意思嗎? 如機場跑道那麽平---自嘲沒身材。你懂的。 如果你懂廣東話會比較容易理解。《帝女花》裏有一個長平公主。
Some girls think they don't have a nice figure or they think they are not well-propotioned enough, they would mock at themselves this way.