4. 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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5. Because gravity is a constant, experienced quarterbacks and kickers can account for its effects to move the ball downfield as efficiently as possible.