Zb
abbr. 硼酸锌（zinc borate）
🗣️ 情景例句
There is not a shadow of a doubt that they did it.
毫无疑问，是他们干的。
Learn to say before you sing.
按部就班。
and to exercise such initiative as falls within their sphere,
在各自的工作范围内发挥主动性，