Bb
abbr. 滚珠轴承（ball bearing）；铅笔芯（double black）
🗣️ 情景例句
Do you live on or off campus?
你住在校内还是校外？
The flight number is ak708 on september 5th.
班机号码是9月5日ak708
In the most sacred room of temple, clay fragments of fifteen statues were found.
在庙中最神圣的一间殿堂里发现了15尊陶雕像的碎片。