One way to hold this word: draw a circle around the thing you care about — this recording, this question, this sample — and extraneous is whatever came in from outside that circle. It does not say the thing is bad. It says it is from elsewhere.
這個字可以想成先在你關心的東西外面畫一個圈：這段錄音、這個題目、這份樣本。從圈外跑進來的，就是 extraneous。它不是說那樣東西不好，而是說它來自別的地方。
From the word’s history
Wiktionary gives extraneous as from Latin extrāneus, 'from without, strange', and notes it is a doublet of strange. The outside-the-circle picture is the word's oldest meaning, not a modern extension.
根據 Wiktionary，extraneous 來自拉丁文 extrāneus，意思是「從外面來的、陌生的」，而且它和 strange 是同源的一對。所以「圈外來的」這個畫面，本來就是這個字最早的意思，不是後來才加上去的。
Wiktionary, "extraneous"
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