他在这场比赛中发了20个爱司球。

He served 20 aces in the match.

《牛津词典》

朱克铭从未想过自己有一天会成为英雄，但他恰恰在周六，在甘肃省白银市举办的山地马拉松比赛中拯救了6名参赛者的生命，在这场比赛中，有21人丧生。

Zhu Keming never thought he would be a hero one day, but he was just that on Saturday when he saved the lives of six runners during the mountain marathon in Baiyin, Gansu Province, in which 21 people lost their lives.

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他在这场比赛中一共发了20个ACE球。

He served twenty ACES all together in this match.

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