[] () a situation where companies compete to supply work or goods, or to buy sth, by offering a particular price or amount of money. The offers are kept secret until a particular time when they are all opened and the best offer is chosen. 秘密出价投标；密封递价；暗标◆All closed bids have to be in by 1 June. 所有的密封递价截止日期是 6 月 1 日。➡open bid ➡sealed bid