He ran away without being noticed.

他趁人们没在意跑掉了。

youdao

He entered the room without being noticed.

他进入房间而没被察觉。

youdao

How can you come to Hell without being noticed by Satan and His cohorts?

你怎么能来地狱没有注意到的撒旦和他的同伙？

youdao

Use notes, but use them without being noticed by your audience and you will receive the maximum credit from your audience.

FORBES: A Few Notes on Notes - Media Training

The spectrum of tastes and textures in these elegant miniatures was so complete that without being told, I might not have noticed the absence of anything bovine.

WSJ: La Nouvelle Veg: European Haute-Cuisine Goes Green