求翻译：This is to certify that Mr. Wu tai jun is Principal Program Officer of Guangxi Zhuang Autonomous Region Bureau of Statistics. He is going to visit _________(前往国家名) in_________(入境日期) for _____(天数) days.We guarantee that he will obey the local laws during the visit and come back to china as soon as he finishes the visit, and his position in the unit will be kept for him until his return.Our unit will cover all expenses including health insurance for him.是什么意思？

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