Bb
abbr. 滚珠轴承（ball bearing）；铅笔芯（double black）
🗣️ 情景例句
young and old.
不管是年轻的， 还是年老的。
A useful trade is a mine of gold.
一样有用的手艺是取之不尽的财富。
Shortly afterwards, four more policemen arrived and remonstrated with the workmen.
一会儿工夫，又来了4个警察，规劝工人离开。