the lowest stone in an arch -- from which it springs
impost的用法和樣例：
例句
用作名詞 (n.)
Although tea's unpopularity was usually attributed to its high price, its popularity remained low even after temperance advocates succeeded in getting the impost halved. 儘管人們很少喝茶是因為價格貴，可即使是適當禁酒主義者通過活動把茶葉關稅降低了一半后，喝茶的人還是不多。
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