达到一定比分以后，运动员就互换场地。
After a certain number of points, the players changed round.
达到一定比分后，运动员就互换场地，这样双方都不至由于风向和阳光的位置而独得优势。
After a certain number of points, the players changed round so that neither could benefit unduly from the wind or the position of the sun.
达到一定比分后，运动员就互换场地，这样双方都不致由于风向和阳光的位置而独得优势。
After a certain number of points, the players changed round so that neither could benefit unduly from the wind or the position of the sun.
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