imperative

Compared meaning: needing immediate action (adjective).

比较义项：紧急的，急需处理的（形容词）。

• urgent

  The most common and general word for something needing immediate action, used for anything from phone calls to medical cases; neutral in tone, and freely placed before nouns like message, care, or need.

  urgent 是这三者中最常用、最通用的词，用来形容各种需要立即处理的事情，从电话到医疗紧急情况都可以用；语气中性，可自由修饰 message（信息）、care（护理）、need（需求）等名词。

  She sent an urgent message asking him to call back immediately.

  她发了一条紧急信息，让他立刻回电话。

• pressing

  Stresses the weight of an unresolved problem more than pure time pressure; typically pairs with issue, matter, need, or concern, and sounds odd applied to concrete objects like a message or a call.

  pressing 更强调未解决问题所带来的负担，而不只是时间上的紧迫；通常与 issue（问题）、matter（事项）、need（需求）、concern（关切）搭配，用来修饰 message（信息）或 call（电话）这类具体事物会显得别扭。

  We have a pressing issue that needs to be solved today.

  我们有一个紧迫的问题需要今天解决。

• imperative 本词

  The strongest of the three, meaning absolutely essential or unavoidable rather than simply time-sensitive; often appears in the pattern 'it is imperative that' with a subjunctive verb, stressing necessity over urgency.

  imperative 是三者中语气最强的，表示绝对必要、别无选择，而不只是时间紧迫；常用于 it is imperative that（……是势在必行的）这一句型，搭配虚拟语气动词，强调“必要性”而非单纯的“紧急性”。

  It is imperative that we finish this report by Friday.

  我们必须在星期五之前完成这份报告，这是势在必行的。

Urgent, pressing, and imperative all mean needing quick action, but strength differs. Urgent is neutral and general, for many kinds of urgent things. Pressing stresses a heavy problem, often with 'issue' or 'matter'. Imperative is the strongest, meaning absolutely necessary. The grammar sense isn't compared.

这三个词都可以形容“需要立即处理”的事情，但语气强弱和使用场合不同：urgent 语气中性、用法最广，可修饰各种紧急的人或事；pressing 更强调问题本身带来的压力或负担，常与 issue、matter 搭配；imperative 语气最强，表示“绝对必要、别无选择”，常出现在 it is imperative that 的句型中。这里不比较 imperative 作为语法术语表示“祈使的、命令式的”（如 imperative mood 祈使语气）这一义项。