"他也不求回报" 的英文表达可以是 "He doesn't ask for anything in return" 或者 "He doesn't expect anything in return." 这个表达方式源自英语中常用的一种习惯用语，即 "to expect/ask for/demand something in return"，意思是期望或要求对方给予某种回报。
下面是一些例句：
He always helps others without expecting anything in return. 他总是乐于助人，也不求回报。
She donated a large sum of money to the charity, but she didn't ask for anything in return. 她捐了很多钱给慈善机构，但她并没有要求任何回报。
I'm happy to do this favor for you, but I don't expect anything in return. 我很乐意帮你这个忙，但我并不求回报。
下面是一些例句：
He always helps others without expecting anything in return. 他总是乐于助人，也不求回报。
She donated a large sum of money to the charity, but she didn't ask for anything in return. 她捐了很多钱给慈善机构，但她并没有要求任何回报。
I'm happy to do this favor for you, but I don't expect anything in return. 我很乐意帮你这个忙，但我并不求回报。