B-b
abbr. 滚珠轴承（ball bearing）；铅笔芯（double black）
🗣️ 情景例句
To advertise during prime time TV is very expensive.
在电视的黄金时段买广告是很贵的。
All cats love fish but fear to wet their paws.
猫都爱吃鱼，却怕爪弄湿。
He felt free to talk about his failures or his difficulties.
他可以随便谈论自己的失败或困境。