本委托书自签字之日起，直至与中标方签订合同30天内保持有效的翻译：This power of Attorney from the date of signature until the selected bidder within 30 days of signing the contract remains in effect 什么意思？中文翻译英文，英文翻译中文，怎么说？

青云英语翻译

This power of attorney from the date of signature until the successful bidder signing the contract within 30 days to maintain effective

This power of Attorney from the date of signature until the selected bidder within 30 days of signing the contract remains in effect

This warrant from signs the date, until with is selected the side sign contract in 30 days to maintain effectively

This power of attorney from the date of signing until the parties in a contract remain in effect in 30 days

This power of Attorney from the date of signature until the selected bidder within 30 days of signing the contract remains in effect