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
We can learn a lot by asking.
我们到处问问会学到不少东西。
I understand completely.
我完全理解。
Good afternoon!
下午好！