The golden rule in tennis is to keep your eye on the ball.

打好网球的重要原则是眼要紧盯着球。

《牛津词典》

You need good hand-eye coordination to play ball games.

玩球类游戏，手和眼的动作要协调好。

《牛津词典》

Boys test better in hand-eye coordination, making them more proficient at ball sports.

男孩在手眼协调测试中更出色，这使他们更精通球类运动。

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While both CAIROS and GoalRef use magnetic fields around the goal and need to insert a chip in the ball, Hawk-Eye and GoalControl use a 3D imaging system to determine the precise location of the ball.

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And Shivnarine Chanderpaul was controversially given out to a ball which Hawk-eye predicted would have missed the stumps off James Anderson for 70.

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The controversial Hawk-Eye ball-tracking system, which was developed in England and can accurately call LBWs (leg before wickets), catches and run-outs, is now used in other sports, including tennis.

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