Zb
abbr. 硼酸锌（zinc borate）
🗣️ 情景例句
I know.
我知道。
I couldn't help it.
我没办法。
when he knew that he was dying, he made me promise to go on my own.
他知道自己已奄奄一息，于是他要我答应一定单独回故乡一趟。