B-b
abbr. 滚珠轴承（ball bearing）；铅笔芯（double black）
🗣️ 情景例句
The film touched our hearts.
那部影片打动了我们。
The walls are three inches thick.
这墙3英寸厚。
We are trying to collect money for a wildlife project.
我们正在设法募集资金搞一个野生动物项目。