Obc
abbr. outer back cover 封底; on board checkout 在板校驗; oscillating Baffle column 振動擋板柱（塔）; old brutal convict 時間長而令人痛苦的肺病
??? 情景例句
That's a great idea.
好主意。
I'm going to show him how to sing a song.
我正要指點他如何唱歌。
Did he say what it was about?
他講了什么事嗎？