secretly

例句：

1. 1. He secretly followed her to the meeting room.
   他秘密地跟随着她来到了会议室。
2. 2. They were so busy that they didn't have time to talk about it secretly.
   他们太忙了以至于没有时间秘密地谈论它。
3. 3.The couple kept their love a secret, never revealing it to others.
   这对夫妇保守着他们的爱，从未向其他人透露过。