Picture a small girl with golden hair standing in a kitchen that is not hers. Three bowls of porridge are on the table. One is too hot, one is too cold, and the third one is just right. Everything this word does comes back to that girl and that third bowl. The hair gives us a playful name for a blond child. The third bowl gives us a way to say that something sits exactly between too much and too little.
可以想成一個金髮小女孩，站在一間不是自己家的廚房裡。桌上有三碗粥。一碗太燙、一碗太涼，第三碗剛剛好。這個字的每一種用法，都繞回這個女孩和那第三碗。那頭金髮，變成拿來叫金髮小孩的玩笑稱呼。那第三碗，變成一種說法：不多也不少，正好落在中間。
From the word’s history
The name itself seems to be gold plus locks, an old word for a tuft or curl of hair — so the name reads as 'golden hair', which is the girl the story draws.
這個名字看起來是 gold（金色）加上 locks 組成的。locks 是舊一點的用法，指「一綹頭髮、捲髮」。所以名字字面上就是「一頭金髮」，正好就是故事裡畫出來的那個女孩。來源說法本身帶著「apparently（看來是）」的保留語氣，不是百分之百確定。
Wiktionary, "Goldilocks"
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