1998年在日本举行的第13届世界排球锦标赛上将采用一种特殊的规则。其中引人注目的有三点：①设立人们早以熟悉的专职自由防守队员；②采用彩色排球；③教练员在比赛进行时可以在专门设置的区域内移动，从场外自由对选手发布指示。在1997年世界杯赛中所采用的25分钟制规则由于 A special rule will be adopted at the 13th World Volleyball Championships in Japan in 1998. Among them, there are three striking points: ① the establishment of people as early as the familiar full-time Liberty defensive player; ② the use of color volleyball; ③ coaches in the race can be set in a special area to move from outside freedom to release instructions to the players. The 25-minute rule adopted at the 1997 World Cup was due