It's not easy for somebody to get into the building unobserved.
进入这栋大楼而不被发现很不容易。
Looking around to make sure he was unobserved, he slipped through the door.
他四下看看，确定没人看见他，就从门里溜了进去。
He took his seat in an unobserved corner of the assembly room.
他在会议室一个不为人注意的犄角坐下来。
如果观测不到，那它会通过。
He slipped from the house unobserved.
在没人看到的时候，他溜出那座房子。
He slipped unobserved out of the house.
他乘人不觉溜出房间。
There were plenty of places to pull off the highway and be unobserved.
有许多地方是远离公路而不受人注意的。
Being small and quiet, it can get close to targets unobserved, for a good look.
由于安静小巧，它能够不被察觉地接近目标，并获得良好的观察效果。
They built a platform in the trees from which they could watch the animals unobserved.
他们在树上搭了个高台，从那里可以观察动物而不被察觉。
Theoretically, in China this is an unobserved point in foreign language teaching (FLT).
这是国内外语教学研究的一个盲点。
Theoretically, in China this is an unobserved point in foreign language teaching (FLT).
这是国内外语教学研究的一个盲点。
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