如果你想表达有人在英语或国语方面很厉害，你可以使用下列表达方式：
英语：
He is proficient in Engpsh.
She is fluent in Engpsh.
He has a high level of Engpsh proficiency.
国语：
He is proficient in Mandarin.
She is fluent in Mandarin.
He has a high level of Mandarin proficiency.
注意： proficient 表示熟练，fluent 表示流利，proficiency 表示熟练程度。
英语：
He is proficient in Engpsh.
She is fluent in Engpsh.
He has a high level of Engpsh proficiency.
国语：
He is proficient in Mandarin.
She is fluent in Mandarin.
He has a high level of Mandarin proficiency.
注意： proficient 表示熟练，fluent 表示流利，proficiency 表示熟练程度。