Bb
abbr. 滚珠轴承（ball bearing）；铅笔芯（double black）
🗣️ 情景例句
Good-bye.
再见。
Mr. Stone Jones of the United Nations.
来自联合国的世通.琼斯先生。
It is because his feet move on, but his head stays still.
这是因为他的脚动了，而他的头保持着静止。