炉火纯青

high degree of professional proficiency

1. 他们赞佩表演炉火纯青。
   They were impressed by the sheer professionalism of the performance.
2. 她的歌唱得已是炉火纯青。
   Her singing was perfection.

炉的英语翻译：

火的英语翻译：

纯的英语翻译：

青的英语翻译：