fit

Compared meaning: right or appropriate for something (adjective).

比较义项：合适的、适当的（形容词）。

• fit 本词

  Common in the fixed phrases 'fit for' and 'fit to' + verb, carrying a formal, judging tone about meeting a standard; less used than 'suitable' for everyday descriptions.

  常见于固定搭配「fit for」和「fit to + 动词」，语气较正式，带有是否达到某种标准的评判意味；在日常描述中不如 suitable 常用。

  He didn't think the report was fit to be sent to clients in its current state.

  他认为这份报告目前的状态还不适合发给客户。

• suitable

  The most common, neutral word for 'appropriate', typically followed by 'for' plus a purpose or audience; used across everyday and formal contexts to describe things or content.

  是表示「合适」最常用、最中性的词，后面常接「for」加用途或对象；广泛用于日常和正式语境，描述事物或内容是否合适。

  This film isn't suitable for young children because of the violence.

  这部电影因为有暴力情节，不适合小孩子看。

• suited

  Usually combined with 'well' or 'ill' and followed by 'to' or 'for', describing how well someone's character, skills or qualities match a role or situation.

  常与「well」或「ill」连用，后接「to」或「for」，用来描述一个人的性格、能力与某个角色或情境是否契合。

  With her patience and warmth, she's perfectly suited to teaching young children.

  凭着她的耐心和温暖，她非常适合教小孩子。

Fit, suitable, and suited all mean 'appropriate'. Fit appears in phrases like 'fit for', with a formal tone. Suitable is the most common, neutral word, usually followed by 'for' plus a purpose. Suited combines with 'well' or 'ill', describing how someone's character matches a role.

这三个词在「合适、适当」这一意义上很接近，但语域和搭配不同：fit 常见于固定搭配「fit for」「fit to do」，语气较正式，带有是否达到某种标准的评判意味；suitable 是最常用、最中性的说法，常接「for」表示对象或用途；suited 常与「well」「ill」连用，侧重性格、能力与角色或情境之间的契合。这里不比较 fit 表示「健康的」或作动词表示「（尺寸）合身」的用法，也不比较 suited 表示「穿着西装的」这一较少见用法。

Compared meaning: a sudden attack of illness with shaking (noun).

比较义项：突发的疾病发作（惊厥、抽搐）（名词）。

• fit 本词

  General, everyday word for a sudden attack of illness (often a seizure); very common in the set phrase 'epileptic fit'; can also describe attacks without violent shaking.

  日常、笼统的说法，指突发的疾病发作（通常是癫痫发作）；常见于固定搭配“epileptic fit”（癫痫发作）；有时也可指没有剧烈抽搐的发作。

  The child has an epileptic fit about once a month.

  这个孩子大约每隔一个月就会癫痫发作一次。

• convulsion

  More clinical, specific word emphasizing violent, uncontrollable shaking of the muscles; often used for babies with fever (a febrile convulsion) or as the medical term for a seizure's physical symptoms.

  更专业、具体的说法，强调肌肉剧烈、无法控制的抽搐；常用于描述婴儿因发烧引起的“热性惊厥”，或作为癫痫发作中抽搐症状的医学术语。

  The baby's high fever triggered a violent convulsion.

  婴儿的高烧引发了一阵剧烈的惊厥。

Fit and convulsion both mean a sudden attack of illness, but fit is the everyday word (as in 'epileptic fit'), while convulsion is more clinical, stressing violent shaking of the muscles, often for a baby's fever. Other meanings (clothes fitting; social upheaval) are not compared.

这两个词都可以指身不由己、突然发生的疾病性发作，在“惊厥／抽搐”这一义项上意思相近，但语体和侧重点不同：fit 更口语、更笼统，convulsion 更强调剧烈的肌肉抽搐、语气也更专业。这里不比较 fit 的“（衣服等）合身”或“一阵情绪（如愤怒、大笑）”义，也不比较 convulsion 的“（社会、政治的）动乱、剧变”义。