那时利斯顿已经蝉联了两年世界冠军，公认所向无敌。

Liston had been world champion for two years, and was deemed by many to be invincible.

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十年来打遍天下无敌手的国际象棋世界冠军卡斯帕罗夫在与人工智能棋手“更深的蓝”的系列对抗赛中失利。

For the undefeated International chess champion, Kasparov, he suffered a defeat to the artificial intelligence chess program "Deep Blue" in a series of competitions.

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