The picture can be taken straight from the words: a gap cut in a wall, just big enough to put a hand through. Both meanings can be thought of as that same small opening, met in two different countries. In Britain the opening is in the side of a bank, and money comes out of it. In America it is a doorway so narrow that the whole shop behind it feels like a gap in the street.
這個詞的畫面可以直接照字面想：牆上挖出來的一個小口，大概只夠伸一隻手進去。兩個意思都可以想成同一個小口，只是在不同的地方遇到它。英國人看到的是銀行牆上的那個口，錢從裡面遞出來；美國人看到的是巷子裡窄窄的一道門，門後那家店小到像街上缺了一塊。
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