Obc
abbr. outer back cover 封底; on board checkout 在板校验; oscillating Baffle column 振动挡板柱（塔）; old brutal convict 时间长而令人痛苦的肺病
🗣️ 情景例句
That's a great idea.
好主意。
I'm going to show him how to sing a song.
我正要指点他如何唱歌。
Did he say what it was about?
他讲了什么事吗？