秘密行走

例句：

1. 1. The couplewas secretive about their relationship.
   这对夫妇对他们的关系守口如瓶。
2. 2.She is secretive about her past.
   她对她的过去守口如瓶。
3. 3. He is secretive in his movements.
   他在行动上总是保密。