B-b
abbr. 滚珠轴承（ball bearing）；铅笔芯（double black）
🗣️ 情景例句
What broke up their friendshop?
是什么破坏了他们的友情呢？
A little body often harbours a great soul.
莫道身躯小，伟人寓其间。
I think we can draw up a tentative plan now.
我认为现在可以先草拟一具临时方案。