Ook
abbr. 通断键控；开关键控（On-Off Keying）
🗣️ 情景例句
Sounds like.
声音像……
The restaurant doesn't open until seven forty-five.
饭馆要到七点四十五分才开门。
they can locate and steer clear of obstacles -- or locate flying insects on which they feed.
并能通过回声来确定并躲开障碍物，或找到它们赖以为生的昆虫。