研究：警察广泛存在睡眠障碍

词汇讲解：

1. survey vt调查,向...作调查
例句：In five of the villages that were surveyed, non-farm work provided one quarter of their income.
在五个被调查的村子中,非农工作为它们提供了四分之一的收入。

2. impair vt.损害, 削弱
例句：Smoking impairs our health.
吸烟会损害我们的健康。

3. screen vt. 审查, 甄选
例句：Unsuitable candidates were screened out.
那些不合格的候选人被筛选掉了。

4. obstructive adj. 故意阻碍的
例句：He doesn’t really have an alternative suggestion; he’s just being deliberately obstructive.
他并非真有其他建议，只不过是有意作梗。

5. brief adj. 短暂的, 短时间的
例句：There was a brief pause in the conversation.
对话中有短暂的停顿。

6. interrupt vt. 打断
例句：You'd better not interrupt him. He is sleeping.
你最好别打扰他, 他在睡觉。

7. diagnose vt.诊断
例句：The doctor diagnosed my illness as a rare skin disease.
医生诊断我的病为罕见的皮肤病。

8. scramble vt. 争夺, 争抢；混杂; 把…搅乱
例句：The reporters scrambled for the phones.
记者们争抢电话。

9. fitness n. 健康，健壮
例句：They’re doing exercises to improve their fitness.
他们为增强体质而做体操。

10. shift n.转换, 转变
例句：A sudden shift in the wind warned of the coming storm.
风向的突然改变预示暴风雨来临。