When Troy Polamalu intercepts a pass and dashes downfield, my spirits soar.
当特洛伊·波拉马鲁截断了一个传球，飞驰向前场的时候，我的情绪高涨了。
He's determined to get downfield, but at any given moment he may need to go sideways or even backwards to get there.
他要有决心前传(downfield)直达，但在任何指定的时刻，他可能需要横传(sideway)甚至后传(backward)才能到达。
Because gravity is a constant, experienced quarterbacks and kickers can account for its effects to move the ball downfield as efficiently as possible.
因为重力是常数，经验丰富的中卫和前锋可以算出重力的影响，尽可能迅速的把球传到前场。
Because gravity is a constant, experienced quarterbacks and kickers can account for its effects to move the ball downfield as efficiently as possible.
因为重力是常数，经验丰富的中卫和前锋可以算出重力的影响，尽可能迅速的把球传到前场。
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