under the sun片語KK [ˋʌndɚ ðə sʌn] /ˈʌndɚ ðə sʌn/發音片語1天下、世上、天底下They chatted for hours about every topic under the sun.他們聊了好幾個小時,天下什麼話題都談到了。2究竟、到底口語、舊式What under the sun made you sell that beautiful old house?你究竟為什麼要把那棟漂亮的老房子賣掉?