B-c
abbr. 公元前（Before Christ）
🗣️ 情景例句
Never mind.
无所谓。
I stayed and did some extra work.
我留下加了一会儿班。
Both men had just begun to swim towards the shore, when they noticed with dismay that the speedboat was moving in a circle.
两个人刚开始向岸边游去，就突然惊愕地发现快艇正在转着圈行驶，