Undetected means nobody noticed. It almost always attaches to something that was there all along and slipped past whoever was supposed to catch it — a crack in a wall, a fault in a program, a disease in the body, someone sneaking through a border.

Undetectedundetected means nobody noticed意思是沒有人注意到. It almost always attaches to something它幾乎都是用來形容某個東西 that was there all along一直存在著 and slipped past whoever was supposed to catch it卻躲過了原本該抓到它的人或系統 — a crack in a wall像牆上的裂縫, a fault in a program程式裡的錯誤, a disease in the body身體裡的疾病, someone sneaking through a border或有人偷偷越過邊境.

The classic pattern is "go undetected" or "pass undetected", and that pattern does most of the work in real English: "the leak went undetected for months", "the error went undetected until the audit". You can also put it before a noun ("an undetected illness"), though that is rarer.

The classic pattern最典型的用法 is "go undetected" or "pass undetected"是"go undetected"或"pass undetected", and that pattern does most of the work in real English而這個用法在真實英文裡佔了大部分: "the leak went undetected for months"像"the leak went undetected for months"(這個漏洞好幾個月都沒被發現), "the error went undetected until the audit""the error went undetected until the audit"(這個錯誤一直到查核時才被發現). You can also put it before a noun你也可以把它放在名詞前面 ("an undetected illness"像"an undetected illness"), though that is rarer不過這樣用比較少見.

Two shades to feel. First, it usually implies there was some system doing the looking — a scan, a guard, a test, a camera — so it is not just "nobody happened to see it"; it is "it beat the checking". Second, the thing undetected is nearly always bad or unwanted. English does have neutral uses in science ( "the signal remained undetected"), but in ordinary reading the word comes wrapped in a small sense of danger.

Two shades to feel有兩層細微差異要感受. First首先, it usually implies there was some system doing the looking它通常暗示有某種系統在監看 — a scan, a guard, a test, a camera像掃描、警衛、檢驗、攝影機 — so it is not just "nobody happened to see it"所以不只是「剛好沒人看到」; it is "it beat the checking"而是「它躲過了檢查」. Second第二, the thing undetected未被發現的那個東西 is nearly always bad or unwanted幾乎都是不好的、不受歡迎的東西. English does have neutral uses in science英文在科學上也有中性的用法 ( "the signal remained undetected"像"the signal remained undetected"), but in ordinary reading但在一般閱讀裡 the word comes wrapped in a small sense of danger這個詞總是帶著一絲危險的意味.

It is a formal, written word: news, medicine, technology, security. In conversation people say "nobody noticed" or "it slipped through".

It is a formal, written word這是個正式的書面用詞: news, medicine, technology, security像新聞、醫學、科技、安全領域. In conversation在對話裡 people say people會說 "nobody noticed" or "it slipped through""nobody noticed"或"it slipped through".