declaration

Compared meaning: a public statement or notice (noun).

比较义项：公开发布的声明或公告（名词）。

• announcement

  The general, neutral word for making information public; can be formal or informal and is used for everyday matters, unlike the more official declaration or proclamation.

  最普通、中性的词，指公开发布信息；可以是正式或非正式场合，也可用于日常事务，不像declaration或proclamation那样官方、正式。

  The teacher made an announcement about tomorrow's canceled field trip.

  老师就明天实地考察被取消一事发布了一则通知。

• declaration 本词

  A formal, official statement that firmly asserts or announces something significant, such as ending a conflict or independence; emphasizes formally confirming a fact, not casual news.

  正式、官方的声明，郑重宣告或宣布某件重大的事情，例如宣布结束冲突或宣布独立；强调正式确认某一事实，而非随意发布的消息。

  The president signed a declaration ending the conflict.

  总统签署了一份结束冲突的声明。

• proclamation

  An official public announcement issued by a person in authority, such as a government or a mayor, often read aloud ceremonially; emphasizes the formal act of declaring via authority.

  由官方权威人士（如政府或市长）发布的正式公开公告，常常被郑重宣读；强调借助权威正式公开宣告的行为。

  The mayor read a proclamation announcing the new holiday.

  市长宣读了一份宣布新假日的公告。

All three mean a public statement. Announcement is the most general word, for everyday or formal use. Declaration is a formal, firm statement about something important, like independence (not its other sense, a customs form). Proclamation is an official statement from an authority, given ceremonially.

这三个词在“公开声明/公告”这一义项上意思相近，但正式程度和使用场合不同：announcement最通用，日常或正式场合都可以使用；declaration强调正式宣告或确认某件重要的事情，例如宣战、独立或停战；proclamation强调由政府或权威人士发布的正式公告，常带有仪式性质。这里不比较declaration在“海关申报单”等语境中的其他用法。