He entered the room without being noticed.
他进入房间而没被察觉。
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。
Time goes without being noticed.
时间在不知不觉中就过去了。
He ran away without being noticed.
他趁人们没在意跑掉了。
Very often, they come quietly and go by without being noticed.
它们常常是悄无声息地来，又默默而去。
Luckily, I managed to slip out the door without being noticed.
幸运的是，我趁他没注意，从门口溜走了。
Amid the confusion the two men slipped away quietly without being noticed.
在混乱中，这两个人悄悄溜走了，未被人察觉。
While learning Chinese characters, children's intelligence develops without being noticed.
在学习汉字的过程中，孩童们的智商也无形中提高了。
I truly understand the unpredictability of life, which often changes within an instant without being noticed.
我强烈地认识到生命的无常，在不经意的瞬间就会改变！
Kellner suspected that the man had used his magazines to cover the phone so he could take it without being noticed.
卡奈尔怀疑那个男人用杂志作掩护，偷走了手机。
If we are always sitting and waiting for the introduction from relatives or friends, the best opportunity may have slipped away without being noticed.
如果我们总是坐着等待亲戚或者朋友的介绍，最好的机会可能会溜走而不被发现。
The collapse of the old ways could have hardly have passed by without being noticed, and all in all it means that people are very receptive to the idea of receiving something new.
虽然旧有方式的崩溃很难不引人注意，但总的来说，这都说明人们并不排斥去接纳新事物这个想法。
The collapse of the old ways could have hardly have passed by without being noticed, and all in all it means that people are very receptive to the idea of receiving something new.
虽然旧有方式的崩溃很难不引人注意，但总的来说，这都说明人们并不排斥去接纳新事物这个想法。
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