“归还原主”常见的英文表达是 “return to the rightful owner” 或 “restore to the original owner”。
“return to the rightful owner” 强调将物品归还给合法、应得的主人， “rightful” 突出合法性和正当性。
“restore to the original owner” 侧重于把物品恢复到最初拥有者的手中， “restore” 有恢复、归还之意。
例如：
The lost wallet was finally returned to the rightful owner.（丢失的钱包最终被归还原主了 。）
We should restore the stolen painting to the original owner as soon as possible.（我们应该尽快把被盗的画作归还原主 。）