发球制胜分和下网出界有啥区别
【 在 CORDIC 的大作中提到: 】
: From wiki:
: Ace: Serve where the tennis ball lands inside the service box and is not touched by the receiver; thus, a shot that is both a serve and a winner is an ace. Aces are usually powerful and generally land on or near one of the corners at the back of the servi
: ce box. Initially, the term was used to indicate the scoring of a point.
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