He entered the room without being noticed.
他进入房间而没被察觉。
Old age creeps on without being noticed.
不知不觉已到老年。
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。
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。
He ran away without being noticed.
他趁人们没在意跑掉了。
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