标书有效期 meaning in English

tender validity period
validity of tender

4 withdrawal of a tender during the interval between the deadline fo ` r submission of tenders an ` d the expiration of the period of tender validity may result in the fo ` rfeiture of tender security pursuant to clause 14
（四）在提交标书最后期限和标书有效期满之间的时间撤标将按条款十四的规定失去投标保证书。
3 in the event of a tenderer agreeing to a specified extension of tender validity in accordance with clause 13 of the instructions to tenderers , the tenderer shall provide an extension in the validity of the tender security of one calendar month beyond the validity of the extended tender
（三）如果投标者同意按十三款的规定延长标书有效期，则应相应地把投标保函的有效期延长到标书有效期结束后一个月。