the answer to...为固定搭配，意为“……的答案/回复”。介词to构成的结构做后置定语，修饰前面的名词answer。answer用作动词的基本意思是“回答，答复”，可以用言语回答，也可以用文字回答，还可以用行动回答，视宾语的不同可灵活翻译。
(1)Marriage is not the answer to everything.
(2)This drug could be the answer to our prayers.
(3)Cathy thought that she had the answer to everything
(4)I do not think we actually know the answer to this question right now.
(5)Surely the answer to both questions is yes.
1.the way to “去……的路”
(1)I believe this treaty will pave the way to peace in Europe.
(2)He studied his map, trying to memorize the way to Rose's street.
(3)Does anybody know the way to the bathroom?
2.the key to “……的钥匙/关键”
(1)The key to success is to be ready from the start.
(2)The key to his success is his logical mind.
(3)The key to our success in these areas was the team and the culture.