He passed by without anyone noticing him.
他从旁边走过，谁也没有注意到他。
He entered the room without anyone noticing him.
他进入房间，没有人察觉到他。
He entered the room without anyone noticing him.
他进入房间而没被察觉。
He passed into the house without my noticing him.
我还没注意到他，他就进了这所房子。
I was trying hard to observe him, watching him, noticing him.
我一直很努力地观察他，看着他，注意他。
I was trying hard to observe him, watching him, noticing him.
我一直很努力地观察他，看着他，注意他。
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