问题描述：
请高手们帮忙翻译以下关于合同的资料,谢谢~~在线等,拒绝机译.若能解答,将追加分数.
It is a stipulation of our purchasing policy that all contractors hold valid Public Liability Insurance with a minimum value of £5,000,000 (5 Million), a copy of the insurance certificate must be provided and placed on file before any work commences.
It is a stipulation of our purchasing policy that all contractors hold valid Public Liability Insurance with a minimum value of £5,000,000 (5 Million), a copy of the insurance certificate must be provided and placed on file before any work commences.
问题解答：
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