"成绩优秀" 的英文表达是 "excellent performance" 或 "outstanding performance"。
"Excellent" 来自拉丁文 "excellens"，意思是 "高超的"。"Outstanding" 来自英文 "out" 和 "stand" 的组合，意思是 "杰出的"。
例句:
John's excellent performance in math class earned him a spot in the school's honor roll.
(约翰在数学课上的成绩优秀，让他跻身学校的优秀生名单。)
The team's outstanding performance in the competition earned them a gold medal.
(这个队伍在比赛中的杰出表现让他们获得了金牌。)