Picture a building you walk into and then keep walking: past the door, past the hall, until you reach one small room right at the middle. That room has been set apart, and only a few people may step inside. Every use of sanctum can be thought of as growing from that last, guarded room.
可以想成一個一層一層往裡走的空間：先進門，再穿過大廳，最後走到最裡面那一小間。那一間被特別留出來，不是誰都能踏進去。sanctum 的各種用法，都像是從這個「最裡面、被劃出來、要被允許才能進」的畫面長出來的。
From the word’s history
From Latin sānctum, "that which is holy" — something set apart from ordinary use.
來自拉丁文 sānctum，意思是「神聖的東西」。可以想成：先有「被劃出來、跟日常隔開」的概念，才有「最裡面那一間」的用法。
Wiktionary, "sanctum"
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