bidder

n. 出价人,投标人

Bidder shall have the right to refuse to grant such an extension of validity of bid without forfeit their bid bond.

投标人有权拒绝延长投标有效期限并不会因此而失掉其投标保证金。

No bidder shall be permitted to alter his bid after the bid has been open.

开标以后，任何投标人都不准再修改投标。