repeat

Compared meaning: to say something again that was already said (verb).

比较义项：把已经说过的话再说一遍（动词）。

• repeat 本词

  The most neutral, general word for saying something again exactly as before; often used when a listener did not hear or understand the first time. Can also apply to actions, which is not true of the others.

  语气最中性、最常用，指把某句话原样再说一遍；常用于对方没听清或没听懂的时候。也可以用于重复某个动作，这一点是另外两个词没有的。

  Sorry, could you repeat that? I didn't quite catch your name.

  抱歉，你能再说一遍吗？我没听清你的名字。

• reiterate

  A formal word implying you say a point again for emphasis, so listeners remember or take it seriously; used for statements already made, never for physical actions.

  正式用词，表示为了强调或让人牢记而把已经说过的观点再说一遍；只用于已经表达过的话，不能用于重复动作。

  The coach reiterated that practice starts at six sharp, not six thirty.

  教练再三强调训练是六点整开始，不是六点半。

• restate

  A formal word implying you say something again using different or clearer wording, usually to remove confusion; not an exact word-for-word repetition.

  正式用词，表示换一种说法、说得更清楚，通常是为了消除误解；不是逐字重复原话。

  Could you restate the instructions in simpler words? I'm still confused.

  你能用更简单的话把说明再说一遍吗？我还是不太明白。

Repeat, reiterate and restate all mean to say something again, but differ in tone. Repeat is common and neutral, often when a listener didn't hear. Reiterate is formal, repeating a point for emphasis. Restate is formal too, saying something again with clearer wording.

这三个词都表示把说过的话再说一次，但语气和语域不同：repeat 最中性、最常用；reiterate 强调为了强调重点而正式地重复；restate 强调换一种说法把话说得更清楚。这里不比较 repeat 表示“重复某个动作”的用法（如重复一遍动作或过程）。

Compared meaning: something happening or done again (noun).

比较义项：重复（名词）。

• repeat 本词

  Refers to a single instance of something happening or being said again; often countable, used for a specific recurrence such as a repeated question, broadcast, or event.

  指某事再次发生或被说一次的具体一次，常作可数名词，用于某件被重复的具体事情，如重复的问题、重播的节目或重复发生的事件。

  The show is a repeat, so I've already seen this episode before.

  这个节目是重播，所以我已经看过这一集了。

• repetition

  Refers to the general act or process of repeating something, often uncountable, used for practice, habits, or patterns rather than one specific occurrence.

  指重复某事这一行为或过程本身，常作不可数名词，多用于练习、习惯或反复出现的模式，而非某一具体的重复事件。

  Repetition is one of the most effective ways to memorize new vocabulary.

  重复是记忆新词汇最有效的方法之一。

Repeat and repetition both mean something happening again, but with different focus. Repeat refers to one specific instance happening or being said again, often countable. Repetition refers to the general act or process of repeating, often uncountable, used for practice, habits or patterns.

两词都指“再次发生或再做一次的事情”，但 repeat 更侧重具体的某一次重复行为或被重复的内容本身，repetition 更侧重“重复”这一行为或过程本身，常用于描述反复练习、训诫或重复的模式。