be proficient in

• 熟练； 精通

be proficient in的用法和样例：

例句

1. One always has to keep in practice.
   任何人都必须经常练习以求熟练。
2. The unskilled jobs are going to be automated out.
   非熟练工种正被自动操作所替代。
3. He is skilled in upstairs politics.
   他精通上层政治。
4. She was very proficient in music.
   她非常精通音乐。