tiptoeing

He waited until his daughter was asleep, then tiptoed quietly out of the room.

他等女儿睡着后才蹑手蹑脚地悄悄走出了房间。

They walked across the room on tiptoe so as not to wake the baby.

他们蹑手蹑脚地穿过房间，生怕惊醒婴儿。