the lowest stone in an arch -- from which it springs
impost的用法和样例：
例句
用作名词 (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. 尽管人们很少喝茶是因为价格贵，可即使是适当禁酒主义者通过活动把茶叶关税降低了一半后，喝茶的人还是不多。
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