B1 保守秘密
to not tell anyone a secret that you know
It's hard to keep a secret in a school.
I asked him if he could keep a secret.
These records of arrests and imprisonment can't be kept a secret any longer.
It is essential that people can trust their lawyers to keep their secrets.
The cause of his death was a secret she kept for more than thirty years.
See also: keep verb (CONTINUE TO HAVE)