Bac
abbr. 二进制模拟转换（Binary-Analog Conversion）；（美国）波音飞机公司（Boeing Airplane Company）；英国飞机公司（British Aircraft Corporation）
🗣️ 情景例句
Please do the work at your own convenience.
请在方便时把这事做一做。
Of nothing comes nothing.
无中不能生有。
The men were now obliged to try once more.
工人们只得再来一次。