B-b
abbr. 滚珠轴承（ball bearing）；铅笔芯（double black）
🗣️ 情景例句
I have a tourist visa.
旅游签证。
I'm fine, and you?
我还好，你呢？
I will have to choose presents for all the family soon, but I haven't chosen any yet!
我很快就要为每一位家庭成员选购礼物，但我至今还什么也没买！