B-b
abbr. 滚珠轴承（ball bearing）；铅笔芯（double black）
🗣️ 情景例句
They know that I'm married and that I have a family.
他们知道我结婚了， 有一个家。
We've got to get a mirror for the bashroom.
我们必须有一面镜子放在浴室。
You have my word!
我保证！