Bb
abbr. 滚珠轴承（ball bearing）；铅笔芯（double black）
🗣️ 情景例句
Don't forget about the bet.
别忘了打赌的事。
In case of fire, keep your head.
万一发生火灾，保持镇定。
You've got a point there.
你说的有道理。