求翻译：经调查，7名员工回答问题时对审核员的问题理解错误，以为是问最长加班时间是多久，所以回答加班到21点半，实际今年平时加班为2小时，即20点半，去年有过加到21点半的情况。是什么意思？

After investigation, seven employees to answer questions on the auditor understand it correctly, thought it was asked longest overtime is how long, so answer overtime 21:30 practical this year, overtime hours and 2 hours, ie 20:30, last year Guo added 21:30.

Upon investigation, 7 staff members to answer a question when the wrong understanding of the problems, and thought it was the longest overtime asked how long time, so answer is working overtime to 21 points this year and a half times actual overtime for 2 hours, or 20 points last year and a half has

After the investigation, 7 staffs replied when question to staff auditor's question understanding mistake, thought how long helds responsible the longest overtime is, therefore the reply works overtime to 21 and half o'clock, the actual this year usual working overtime is 2 hours, namely 20 and half

On investigation, 7 staff auditor issues understanding errors when answering the question, that is most long how long is overtime, so answers to work overtime to 21:30, actually usually for 2 hours of overtime this year, namely, 20:30, added to the 21:30 situation last year.

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