If something is unexplained, nobody has given a reason for it — so it stays strange. Notice carefully what the word actually says: it is not that the thing cannot be understood, it is that no explanation has been offered or found. The mystery lives in the missing reason, not in the thing itself.

If something is unexplained如果一件事是unexplained的，nobody has given a reason for it就是沒有人給出原因——so it stays strange所以它就一直維持著奇怪的狀態。Notice carefully what the word actually says要仔細注意這個字真正在說的是什麼：it is not that the thing cannot be understood不是說這件事無法理解，it is that no explanation has been offered or found而是沒有人提出或找到解釋。The mystery lives in the missing reason謎團在於缺少的那個原因，not in the thing itself而不在事情本身。

This is why the word turns up so often in news reports, police reports, and hospital notes, where people are being careful not to guess: 'an unexplained death', 'unexplained delays', 'unexplained weight loss', 'unexplained lights in the sky'. In all of these, the writer is saying 'we do not know why, and we are not pretending to.' That careful, official flavour is worth feeling.

This is why the word turns up so often in news reports, police reports, and hospital notes這也是為什麼這個字常常出現在新聞報導、警方報告和醫院紀錄裡，where people are being careful not to guess因為這些地方的人都小心不亂猜：'an unexplained death'死因不明的案子、'unexplained delays'原因不明的延誤、'unexplained weight loss'不明原因的體重下降、'unexplained lights in the sky'天空中不明原因的光。In all of these這些例子裡，the writer is saying 'we do not know why, and we are not pretending to'作者說的都是「我們不知道為什麼，也沒有假裝知道」。That careful, official flavour is worth feeling這種謹慎、公事公辦的味道值得感受一下。

'Unexplained' is a slightly formal word. In everyday talk a Taiwanese student would more likely hear 'nobody knows why' or 'for some reason'. But in writing — and in the exam reading you will meet — 'unexplained' is everywhere.

'Unexplained' is a slightly formal word'unexplained'是稍微正式一點的字。In everyday talk在日常對話裡，a Taiwanese student would more likely hear 'nobody knows why' or 'for some reason'台灣學生比較常聽到的是'nobody knows why'沒人知道為什麼，或'for some reason'不知道是什麼原因。But in writing不過在書面文字裡——and in the exam reading you will meet也就是你會遇到的考試閱讀——'unexplained' is everywhere'unexplained'到處都是。

Two useful patterns: 'remains unexplained' (the reason still has not been found, often after a long time) and 'for unexplained reasons' (a slightly dry, sometimes faintly annoyed way of saying something happened and nobody told us why). It goes before a noun or after 'be'/'remain'.

Two useful patterns有兩個實用的句型：'remains unexplained' (the reason still has not been found, often after a long time)'remains unexplained'，原因依然沒被找到，常常是過了很久之後，and 'for unexplained reasons' (a slightly dry, sometimes faintly annoyed way of saying something happened and nobody told us why)和'for unexplained reasons'，一種有點乾、有時帶點小小不耐煩的說法，意思是事情發生了但沒人告訴我們為什麼。It goes before a noun or after 'be'/'remain'這個字可以放在名詞前面，也可以接在'be'或'remain'後面。

There is also a small honest wrinkle: doctors especially use it to mean 'we have tested and found no cause', which sounds neutral but often worries patients — the word carries a quiet suggestion that someone has already looked.

There is also a small honest wrinkle還有一個誠實但小小的細節：doctors especially use it to mean 'we have tested and found no cause'醫生特別常用這個字來表示「我們檢查過了，沒找到原因」，which sounds neutral but often worries patients聽起來很中立，卻常常讓病人擔心——the word carries a quiet suggestion that someone has already looked這個字暗暗透露著「已經有人查過了」的意味。