1.Zone: A defensive tactic in which players guard areas of the court, rather than specific men.
区域联防（zone）：球员防守球场的区域，这种防守战术指的不是具体人。
2.Double-team: The defensive tactic of two players guarding one.
两人防守（double-team）：二打一的防守战术。
3.The evolvement and practice of the back-line defensive tactic in modern volleyball games
现代排球后排防守技术的演变与实践