Japans 9 degrees system in many sports items, which originated from Chinese 9 official ranks system, has obvious vestige of feudal class system.
许多日本体育项目的九段制，其起源是中国古代的九品制。
Japans 9 degrees system in many sports items, which originated from Chinese 9 official ranks system, has obvious vestige of feudal class system.
许多日本体育项目的九段制，其起源是中国古代的九品制。
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