"熟练的掌握知识" 可以用英文表示为 "proficiency in knowledge" 或 "expertise in knowledge"。这两个短语的意思都是指对知识的深刻理解和熟练掌握。
"Proficiency" 是一个名词，源自拉丁语 "proficientia"，意思是熟练、技能或能力。"Expertise" 也是一个名词，来源于法语 "expertise"，意思是专业知识或技能。
下面是一些例句：
She has a lot of proficiency in math. 她在数学方面很熟练。
He has a great deal of expertise in computer programming. 他在计算机编程方面很有专业知识。
She is an expert in her field and has a lot of proficiency in her work. 她在自己的领域很有专长，在工作中也很熟练。
He has a lot of proficiency in speaking multiple languages. 他擅长多种语言的口语。
She has a lot of expertise in cooking and can make many depcious dishes. 她在烹饪方面有很多专业知识，能做出很多美味的菜肴。
"Proficiency" 是一个名词，源自拉丁语 "proficientia"，意思是熟练、技能或能力。"Expertise" 也是一个名词，来源于法语 "expertise"，意思是专业知识或技能。
下面是一些例句：
She has a lot of proficiency in math. 她在数学方面很熟练。
He has a great deal of expertise in computer programming. 他在计算机编程方面很有专业知识。
She is an expert in her field and has a lot of proficiency in her work. 她在自己的领域很有专长，在工作中也很熟练。
He has a lot of proficiency in speaking multiple languages. 他擅长多种语言的口语。
She has a lot of expertise in cooking and can make many depcious dishes. 她在烹饪方面有很多专业知识，能做出很多美味的菜肴。