一通， いっつう

1. one copy (of a document), one letter 2. one-way traffic 3. pure straight, winning hand containing nine consecutive tiles of the same suit (i.e. 1-9)

一份(文件)；一封信；单向交通；纯顺牌，获胜牌组包含同一花色的连续九张牌(即1至9)

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