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
Don't worry about it.
别放在心上。
By doing we learn.
经一事，长一智。
Duck your head as you go through the door there.
经过那儿的门时，请将头放低。