“作为回报”的英文表达可以是“in return”或者“as a reward”。这两个短语都常用于描述给予某人某种东西以作为对其行为、服务或恩惠的报答。例如：
- I helped him with his homework, and he bought me a cup of coffee in return.（我帮他做了作业，他作为回报给我买了一杯咖啡。）
- She received a medal as a reward for her outstanding performance.（她因出色的表现而获得了一枚奖章作为回报。）
根据具体语境，这两个短语可以灵活使用。
