Icao
abbr. 国际民航组织（International Civil Aviation Organization）
🗣️ 情景例句
Enjoy yourself.
好好享受。
How long have you had this pain?
疼痛多久了？
A sound made by tapping on the hull of a ship will be reflected from the sea bottom,
敲打船体所发了的声音会从海底传回来，