Mastered
a. 精通的
🗣️ 情景例句
Ms Li, welcome on board.
李小姐，欢迎加入我们！
He has been working in advertising for ten years, but now he is teaching.
他曾经在广告公司服务十年，但现在在当老师。
I'll see that doesn't happen again.
我会注意以后不会再发生那样的事。