She still looks so young. What's her secret?

她看着依旧那么年轻。她的保养秘诀是什么呢？

《牛津词典》

youdao

She must be careful if she meant to keep her secret kingdom.

如果她要保守她的秘密王国，她必须小心。

youdao

The splendid moment to speak about her secret had come.

VOA: special.2010.04.03

Some people believe that Sarah studied the hair product she used and added her own "secret" substance.

VOA: special.2010.03.28

Her lawyer,Robert Baum, said she had not passed secret information to Russia or received any payment.

VOA: special.2010.07.10

Everyone assumed, of course, that her secret was at last a secret no more.

NPR: One Boy's Heroism in the Face of AIDS

She was told the operation was "her secret" and was told not to say anything about it.

BBC: Thousands of women are circumcised each year

If such souls existed, they might know everything about her: the lie of her marriage, her secret thoughts about Harley, her half-formed plans to get away.

NEWYORKER: The Bell Ringer