He broke in as a football player.

他开始当一名足球运动员。

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A heavy object, like a football player moving at a high speed, has a lot of momentum—that is, once he is moving, it is hard to change his state of motion.

一个重物有很大的动量，也就是说，比如一位高速移动的足球运动员一旦运动起来，就很难改变运动状态。

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He is a football player from Britain.

他是英国的一个足球运动员。

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The former football player and coach brought his excitement and love for the sport to television viewers every time he announced a game.

VOA: special.2009.05.01

He is also a former football player.

VOA: special.2010.06.09

He started as a professional football player.

VOA: special.2009.05.01

But even with his limp, Plank always seems to be leaning forward as he moves, like the special-teams football player he once was, looking for a target to hit.

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The downside for Manziel: he is a football player, not a collegiate golfer or boxer, or whatever.

FORBES: Heisman Trophy Winner Manziel Punished By NCAA And NFL

He is a football player, wrestler, and fisherman who hopes to pursue a fisheries science degree in college.

WHITEHOUSE: The White House