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
If you're not sure, then the answer should probably be no.
如果你不确定，那么答案可能就是“不”了。
Have you got your cheque book with you?
您支票本带来了没有？
Would you be kind enough to sign our visitors book?
请在来宾簿上签名好吗？