to是介词，后面要用名词或者动名词。意思是做……的秘密。secret to：表示对……保密，或做/达到……的秘密，后接名词或动名词。例如：The secret to flying a plane。开飞机的秘密。
the secret to doing例句
1、He looks like a man who's found the secret to eternal youth.
他看上去像是一个找到了永葆青春秘诀人。
2、The secret to avoiding this kind of problem is careful pre-planning of your meeting.
避免这类问题的秘密是细心地做好计划。
3、The secret to becoming a loving, nurturing being is just as simple as that.
秘密就是成为一种爱，培养人，就是那么简单。
4、This is the secret to achieving consistent success as a trader.
这是成为持续一致的成功交易者的秘诀。