Translate the following sentence into English.
我们惊讶地发现衣衫褴褛的老头儿其实是一个百万富翁。
【正确答案】：
TO OUR GREAT SURPRISE, THE OLD MAN IN SHABBY CLOTHES WAS IN FACT A MILLIONAIRE.
【题目解析】：
句子主干：老头儿是一个百万富翁。The old man was a millionaire.
翻译思路：添加状语“To our great surprise”、定语“in shabby clothes”、插入语“in fact”。
重点词汇：衣衫褴褛的be in shabby clothes，百万富翁millionaire 。