1. She was so unobservant that she didn't notice the changes in her own neighborhood.
她太不细心了，连她自己社区的变化都没注意到。

2. The teacher criticized the student for being unobservant during the experiment.
老师批评学生在实验中表现得很不细心。

3. He missed the important details because he was unobservant.
他因为不细心而错过了重要的细节。

4. The security guard was unobservant and didn't notice the suspicious person entering the building.
保安不够警觉，没有注意到可疑人员进入大楼。

5. The detective was frustrated with his unobservant partner who missed several crucial clues.
侦探对他不细心的搭档感到沮丧，错过了几个关键线索。

6. Being unobservant can lead to misunderstandings and missed opportunities.
不够细心会导致误解和错失机会。