落后的成绩用英文怎么说

"落后的成绩" 在英语中可以翻译为 "poor performance" 或 "lagging performance".

"Performance" 是指一个人或组织在某一方面的表现或成绩。"Poor" 是形容词，意思是 "劣质的" 或 "差劣的", 而 "lagging" 是动词，意思是 "落后" 或 "跟不上".

例句：

"The company's sales performance has been poor this quarter." (这个公司这个季度的销售成绩很差.)
"The team's lagging performance has been a concern for the coach." (这个队伍落后的表现是教练担心的问题.)