Cavu
abbr. 云高及能见度无限；晴朗与能见度极好（Ceiling and Visibility Unlimited）
🗣️ 情景例句
Oh, Richard! That's wonderful, but--
噢， Richard ，那真是太好了， 可是……
Do you have anything to declare?
你有东西要申报关税吗？
This is because the surface of the earth is not flat but round.
因为地球表面不是平的，而是圆的。