B-b
abbr. 滚珠轴承（ball bearing）；铅笔芯（double black）
🗣️ 情景例句
You have some guests in the reception room.
有几位客人在接待室等 。
What can't be cured must be endured.
不治之症，必须坚忍。
Yes, of course.
当然一样。