B-b
abbr. 滚珠轴承（ball bearing）；铅笔芯（double black）
🗣️ 情景例句
Mid-autumn Festival is a traditional festival for family unification.
中秋节是家人团聚的传统节日。
Deeds,not words.
要行动，不要言词。
A bar of Chocolate.A bottle of milk.A pound of sugar.
一块巧克力、一瓶牛奶、一磅糖、