He entered the room without being noticed.
他进入房间而没被察觉。
youdao
There were never more than three or four pupils in his class, so he had a tough time bunking off without being noticed.
他班里的同学从来没有超过三到四个，所以他不可能做到逃学不引起别人注意。
Old age creeps on without being noticed.
不知不觉已到老年。
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
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