Competitors must be masters of both knocking out and checkmating opponents, as the sport involves alternating rounds of chess and boxing.

参赛者必须精通拳击和国际象棋两者，因为比赛采用拳击和国际象棋交替进行的形式。

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The settings in the film give away a nostalgic feeling: a boxing gym that smacks of the 1920s, and Charlie’s truck looks like something out of a 1940s film.

该片的背景设置流露出一种怀旧之感：带有上世纪20年代味道的拳击馆，查理的卡车则像出自于一部上世纪40年代电影中。

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Boxing is a rough sport in which one boxer tries to knock the other out.

拳击是一项粗野的运动，在比赛中一方力求击倒另一方。

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Maccarinelli's third professional knock-out leaves his boxing career hanging in the balance after being beaten by an explosive shot in the ninth round.

BBC: Warren's warning to Maccarinelli

They took me to the doctors and found a crack in one of my vertebrae -- I was out of boxing for a year.

CNN: STORY HIGHLIGHTS

This is what primarily rules out contact sports like football, boxing and wrestling from head-to-head competition between the sexes.

WSJ: Can Female Athletes Compete Against Men? In Shooting, Yes