seasoned hand

• 老手,得力人手

seasoned hand的用法和样例：

例句

1. He is a practised hand at tennis.
   他是网球老手。
2. But on weapons, Mr Bolton, an old counter-proliferation hand, is in his element.
   然而，拿武器做文章是波尔顿这位防核扩散老手的拿手好戏。