One way to picture it: a plain building stacked to the roof with one kind of thing, kept there until somebody needs it. The word is built exactly that way — store plus house — so the image is right on the surface. Modern English rarely uses it for a real building any more; it spends most of its time saying that something holds as much as one of those rooms would.
可以想成一間堆到屋頂的房子，裡面放的都是同一種東西，等著有人需要的時候來拿。這個字就是 store（存放）加 house（房子）拼出來的，畫面直接寫在字面上。今天的英文比較少拿它指真正的倉庫。它大部分時間在做另一件事：說某個地方、某本書或某個人，裝的東西多到像那樣一間倉庫。
From the word’s history
The packet gives the compound plainly: storehouse is store plus house, with store coming into Middle English through Anglo-Norman from Latin instaurare. Nothing here needs interpreting; the parts still say what the word means.
資料把這個複合字拆得很清楚：storehouse 就是 store 加 house。store 經由盎格魯諾曼語進入中古英文，源頭是拉丁文 īnstaurāre。這個字不需要額外解讀——兩個部分加起來，就是它今天的意思。
Wiktionary, "storehouse"
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