Unannounced means happening with no warning — nobody was told it was coming. Its most common use is about people arriving: 'He turned up unannounced.' Here it works like an adverb, sitting after the verb, and it usually carries a small feeling — surprise, sometimes annoyance, because in most cultures you are expected to say you are coming. An unannounced visit, an unannounced guest, an unannounced inspection.

Unannounced Unannounced means的意思是 happening with no warning事情發生前完全沒有預告 — nobody was told it was coming沒有人事先被告知它要來了. Its most common use它最常見的用法 is about people arriving是講人的到來: 'He turned up unannounced.'『He turned up unannounced.（他毫無預警地出現了。）』 Here這裡 it它 works like an adverb的用法像副詞, sitting after the verb放在動詞後面, and而 it usually carries a small feeling通常還帶著一點情緒 — surprise, sometimes annoyance驚訝，有時候是不悅, because因為 in most cultures在大部分文化裡, you are expected to say you are coming你本來就該先說一聲你要來. An unannounced visit, an unannounced guest, an unannounced inspectionAn unannounced visit（沒有事先通知的拜訪）、an unannounced guest（不速之客）、an unannounced inspection（未經通知的檢查）.

That inspection use is worth knowing on its own. Health inspectors, safety officers and auditors do unannounced checks on purpose, so that nobody can tidy up first. So the word can carry a hint of 'and that was the point'.

That inspection use檢查這個用法 is worth knowing on its own特別值得單獨認識. Health inspectors, safety officers and auditors衛生稽查員、安全官員和查帳人員 do unannounced checks on purpose會故意進行unannounced checks（不預先通知的檢查）, so that這樣 nobody can tidy up first才沒有人能事先整理善後. So所以 the word這個詞 can carry a hint of有時候還帶著一種暗示 'and that was the point'『這就是重點』的.

It also works for events and decisions: 'The change was made unannounced', 'an unannounced product'. In the tech world, an unannounced phone is one the company has not yet admitted exists.

It它 also works for events and decisions也可以用在事件和決定上: 'The change was made unannounced,'『The change was made unannounced（這項改變在沒有事先公布的情況下就發生了）』、 'an unannounced product'『an unannounced product（尚未發表的產品）』. In the tech world在科技圈裡, an unannounced phonean unannounced phone is one指的是 the company has not yet admitted exists公司還沒承認存在的手機.

A thing students miss: unannounced says nothing about whether it was PLANNED. An unannounced inspection is carefully planned — it just was not told to you. It is about the telling, not the planning.

A thing students miss學生常忽略的一點: unannouncedunannounced says nothing about完全沒有講到 whether it was PLANNED這件事有沒有被『計畫過』. An unannounced inspectionAn unannounced inspection is carefully planned其實是精心計畫過的 — it just was not told to you只是沒有先告訴你而已. It它 is about the telling講的是有沒有『事先告知』, not the planning而不是有沒有『事先計畫』.