tender validity period meaning in English

标书有效期

Extension of tender validity period
延长投标书有效期
In exceptional circumstances , prior to the expiry of original tender validity period , the company may demand the tenders for a specified extension of the period of validity
在特殊情况下，公司可以在原定的投标有效期之前，向投标人提出有效期延长到规定时间的要求。
Tender documents not required to be signed and submitted in accordance with clauses 17 and 18 shall be returned to the office of issue before the expiry of the tender validity period , but must not be enclosed with the tender
不需签字和按条款十七、十八规定提交的投标文件应在投标期限到期前归还发行者，但不要与标书合在一处。