fluky

他赢了一场比赛纯属侥幸。

His win in the match was totally ___fluky.

这支球队的胜利很侥幸，全靠几次运气球。

The team's victory was ___fluky, relying on a few lucky shots.

他在考试中的高分完全是靠运气，因为很多题他都是猜的。

His high score in the exam was totally ___fluky — he guessed most of the answers.