Bce
abbr. 化学工程学士（Bachelor of Chemical Engineering ）；土木工程学士（Bachelor of Civil Engineering）；公元前（ before common era）
🗣️ 情景例句
Safety first.
安全第一。
He said he knew a lot of people there.
他说他在那里认识很多人。
He began to catch up with the others.
他开始赶上其他人。