本周一警方消息，日本一名警察因苦于连续两个月超时工作及周末加班，用刀刺伤了自己的肚子，以获得休假的机会。
A Japanese policeman, distraught by working long hours and weekends for two months, stabbed himself in the stomach with a knife to get some time off, police said Monday.
我被一件接着件的紧急案件缠着。连续几周都没有休假。
My day of emergencies had followed weeks of emergencies that had not been broken up by a vacation.
假定部件的工作时间服从指数分布，修理时间和修理工的休假时间均服从一般连续分布。
It is assumed that the operating time of units has an exponential distribution, while the repair-time and the vacation time have general continuous distributions.
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