找不到人／東西
這一支就是核心畫面本身：某個具體的人或物不見了，可能只是離開視線，也可能沒人知道去了哪裡。
going missing · noun · B2
The fact of someone or something becoming impossible to see or find, either because they have gone out of sight or because nobody knows where they are.
失蹤；不見
核心畫面
A picture to hold: something was here, and now the place where it was is empty. You look for it and find nothing — no shape, no trace, no answer. The word names that gap: not the leaving itself, but the fact of the empty place afterwards.
原本在這裡的東西，現在那個位置空了。你去找，找不到——沒有身影、沒有痕跡、沒有交代。這個字指的不是「離開」這個動作，…更多收起
原本在這裡的東西，現在那個位置空了。你去找，找不到——沒有身影、沒有痕跡、沒有交代。這個字指的不是「離開」這個動作，而是離開之後留下的那個空缺本身，所以它常跟調查、報導、研究搭在一起：有人要去解釋那個空白是怎麼來的。也因為它是名詞，句子裡通常在講「這件事」——the disappearance of the two boys（那兩個男孩失蹤這件事）。Two branches
整個不存在了
把核心的空缺從一個地點推到整個世界。差別在於「還能不能找回來」：失蹤的人也許會被找到，但一種語言、一片森林一旦消失，就沒有另一個地方還留著它。
dying out (species/culture) · noun · B2
The fact of something stopping existing, so that it is no longer found anywhere at all — used about things like forests, animals, languages, or ways of life.
消失；絕跡
原始詞典資料4 筆記錄
以下是外部詞典記錄的用法，原文照列，我們還沒有寫成教學內容。上面的說明才是我們自己寫的；有些用法可能上面已經講過了。
disappearancenoun/dɪsəˈpɪəɹəns/
- 1
The action of disappearing or vanishing.
- Wireless phone technology led to the disappearance of once-common coiled cords for telephone handsets.
- As hundreds of volunteers and police scoured parks and waterways in an area of New Orleans Tuesday, there were many questions but few answers about the disappearance 11 days ago of a 26-year-old teacher.
- 2
Passing out of sight.
- From the shore, they watched the disappearance of the ships' masts into the haze.
- 3
Leaving secretly of without explanation
- The prosecuting attorney was concerned about the potential disappearance of witnesses.
- 4
Cessation of existence.
- A single undoubted cure of a demonstrated cancer or sarcoma by this treatment would be enough to say definitely that the treatment exerts some specifically curative influence, for the spontaneous disappearance of undoubtedly malignant growths of this character is almost unknown.
資料來源：英文維基詞典 English Wiktionary（CC BY-SA 4.0）。 原文照列，未經改寫。