continual

Compared meaning: happening many times or again and again (adjective).

比较义项：多次发生、反复出现的（形容词）。

• repeated

  A general, neutral word for something done or happening more than once; it does not itself imply monotony, non-stop continuation, or a fixed interval, and pairs naturally with countable actions like attempts or warnings.

  语气中性、含义笼统，只表示某事发生或做了不止一次；本身并不暗示单调乏味、持续不断或固定的时间间隔，常与「尝试」「警告」这类可数的动作搭配。

  The mechanic made repeated attempts to start the old engine before it finally caught.

  技师反复尝试启动那台旧发动机，最后终于打着了。

• repetitive

  Emphasizes that an action is done the same way each time, so it feels monotonous or tedious; typically describes a task, job, or process rather than a single event.

  强调某个动作每次都以相同的方式进行，因而让人感到单调乏味；通常用来形容任务、工作或过程，而不是单一事件。

  The factory job felt repetitive because he did the same task daily.

  这份工厂工作让他感到单调乏味，因为他每天都做同样的任务。

• continual 本词

  Stresses that something keeps happening again and again, or almost without stopping, over a period of time; often used for something annoying or disruptive, like noise or interruptions.

  强调某事在一段时间内一再发生，或几乎从未停止；常用来形容令人厌烦或造成干扰的事情，例如噪音或打断。

  The continual noise from the street kept the baby awake.

  街上持续不断的噪音让婴儿无法入睡。

• recurrent

  Describes something that goes away and then comes back repeatedly, often at intervals, rather than continuing without a break; common with medical problems, patterns, or themes.

  表示某事消失后又反复出现，通常是间隔性地发生，而不是不间断地持续；常用于描述医学问题、模式或主题。

  He suffers from a recurrent headache that returns every few weeks.

  他患有反复发作的头痛，每隔几周就会发作一次。

All four describe something happening more than once, with different focus. Repeated is the most neutral word. Repetitive means done the same way each time, feeling boring. Continual means happening again and again, almost without stopping. Recurrent means going away and coming back at intervals.

这四个词都表示反复发生或多次出现，但语气和侧重点不同：repeated最为中性、笼统；repetitive强调做法相同而显得单调乏味；continual强调频繁或几乎不间断；recurrent强调消失后又周期性地重新出现。四者不可随意互换。

Compared meaning: happening or continuing without stopping (adjective).

比较义项：持续不断、不间断地发生或持续（形容词）。

• continual 本词

  Describes something that keeps happening again and again, usually with short gaps between occurrences; often used for repeated, sometimes annoying events like complaints or interruptions, rather than one unbroken process.

  表示某事反复、一次又一次地发生，中间通常有短暂间隔；常用于描述令人厌烦的重复性事件，如抱怨或打断，而不是单一不间断的过程。

  Continual complaints from customers finally forced the company to change its policy.

  顾客不断的投诉最终迫使公司改变了政策。

• continuous

  Stresses that something goes on without any pause or break at all — one single unbroken state, line, or process, as in traffic markings or an ongoing flow.

  强调某事持续进行、完全没有停顿或中断——是单一的、不间断的状态、线条或过程，例如交通标线或持续不断的水流。

  A continuous white line down the middle of the road means no overtaking.

  道路中央的一条连续实线表示禁止超车。

• straight

  Placed right after a number of days, times, hours, etc. to mean "one after another with no gap"; mainly used in this consecutive-count pattern, not as a general modifier before a noun.

  紧跟在表示天数、次数、小时数等的名词后面，表示“一个接一个、中间没有间断”；主要用于这种“连续计数”的搭配，而不是作为名词前的普通修饰语。

  The team has won six matches straight this season.

  这支球队本赛季已经连续赢了六场比赛。

• constant

  Emphasizes that something is persistently present or keeps recurring so much it feels relentless, often expressing the speaker's frustration or emotional reaction, rather than literal unbrokenness.

  强调某事持续存在或反复发生到几乎令人无法忍受的程度，常带有说话人的主观情绪或挫败感，而不是字面上的“完全不间断”。

  Constant pressure from work left her feeling exhausted every evening.

  工作中持续不断的压力让她每晚都感到疲惫不堪。

Continual, continuous, straight and constant all mean ongoing, but differ. Continual: happens repeatedly, often with short gaps, like complaints. Continuous: truly unbroken, with no pause at all. Straight: follows a number, as in 'three days straight'. Constant: recurring so much it feels relentless, often emotional.

这几个词都表示事情持续或反复发生而不停止，但在是否真正“不间断”、语法搭配和语气上有所不同：continual 常指反复出现、中间可能有短暂间隔；continuous 强调完全没有中断的单一持续状态；straight 通常紧跟在表示天数、次数等的名词后面，表示“连续第几次”；constant 强调持续不断到让人厌烦或印象深刻的程度，常带主观情绪色彩。这里不比较 straight 的“笔直的、正直的”等其他义项，也不比较 constant 表示“不变的”（如温度恒定）的义项。