at work 和 in work 的区别：

Meanwhile the doctor was at work.

同时医生在工作。[at work (在工作，在上班)]

Is her husband in work?

她的丈夫有工作吗？[in work (有职业，有工作)；其反义词是 out of work (失业)]

Millions of men were out of work.

数百万的人们失业了。