Aac
abbr. 自动振幅控制（automatic ampltiude control）
🗣️ 情景例句
in the conference room.
在会议室。
I ask him to stay at school.
我要求他待在学校。
Later we learnt that there was a very important person on board.
后来我们才得知，飞机上坐了一位非常重要的人物。