mastery

Compared meaning: skilled control of a subject or ability (noun).

比较义项：精通、掌握某项技能或学问（名词）。

• command

  Formal and often refers to fluent control of a language or body of knowledge; typically used as 'command of' with abstract nouns like language or subject.

  较为正式，常指对某种语言或某类知识的流利驾驭；通常以“command of”搭配语言、学科等抽象名词使用。

  She has an impressive command of French after living in Paris for years.

  在巴黎生活多年后，她对法语的掌握令人印象深刻。

• mastery 本词

  Suggests skill gained through sustained practice and effort, especially over a craft, technique, or physical skill; used more broadly, including hobbies and sports.

  强调通过持续练习和努力获得的技能，尤指工艺、技巧或体能技能；使用范围更广，也可用于爱好和体育活动。

  Years of daily practice gave him true mastery of the guitar.

  多年的每日练习让他真正精通了吉他。

Both mean being very good at something. Command is formal, describing fluent control of a language, as in 'command of English'; its 'order' meaning is not compared here. Mastery is skill gained through practice, in a craft or sport, not 'ruling over others'.

这两个词在“精通”这一意义上很接近，但语气和典型搭配不同：command更为正式，常指对语言或学科知识的流利驾驭；mastery则强调通过反复练习获得的精湛技艺，多用于工艺、乐器或体育技能。这里不比较command的“命令、指挥权”义，也不比较mastery的“统治权、支配地位”义。