一份(文件)；一封信

1. one copy (of a document), one letter

noun (common) (futsuumeishi)

单向交通

2. one-way traffic

noun (common) (futsuumeishi) abbreviation

纯顺牌，获胜牌组包含同一花色的连续九张牌(即1至9)

3. pure straight, winning hand containing nine consecutive tiles of the same suit (i.e. 1-9)

noun (common) (futsuumeishi) abbreviation mahjong