在比分为双数时，球必须是从各场区的右发球区（right service court）发出，单数时则应从左发球区（left service court）发出。
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... 右发球区 right service court 左发球区 left service court ; adcourt 双打发球区 doubles service court ...
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互换左右发球区 change service courts
在左场区接发球的球员 left court player
左、右发球区 the left service court
左/右发球区 left/right service court
下一次发球在左发球区进行。
当发球方得分为奇数分时，双方球员应在本方场地的左发球区发球和接发球。
The players shall serve from, and receive in, their respective left service courts when the server has scored an odd number of points in that game.
发球落点区域主要集中在中区，中区及后左区得破率相对较高。
Serving placement region mainly concentrates in the central district, the break rate of central district and the left district is relatively high.
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