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1·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。《牛津词典》

2·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。《柯林斯英汉双解大词典》

3·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。《新英汉大辞典》

4·With only one observation per country, it is impossible to control for unobserved heterogeneity across countries.

由于每个国家只有一个观测结果，因此不可能控制各国间未观察到的异质性。

5·If it's unobserved, it will.

如果观测不到，那它会通过。

6·He slipped from the house unobserved.

在没人看到的时候，他溜出那座房子。

7·He slipped unobserved out of the house.

他乘人不觉溜出房间。

8·You found some unobserved and quiet spot and drowned her.

你找一个不引人注目的僻静地方，然后把她淹死。

9·Bernard, unobserved, had watched the meeting between the two.

伯纳德偷看这爷俩见面没有引起任何人的注意。

10·She contrived to slip away unobserved in the dusk of the afternoon.

她计划乘黄昏时候人不知鬼不觉地溜走。