serving or intended to pre-empt or forestall something, especially to prevent attack by disabling the enemy 抢先的,先发制人的 pre-emptive action. 先发制人的行动。 a pre-emptive strike. 先发制人的打击。 ■relating to the purchase of goods or shares by one person or party before the opportunity is offered to others 优先购买的 pre-emptive rights. 优先购买权。 ■(Bridge)denoting a bid, typically an opening bid, intended to be so high that it prevents or interferes with effective bidding by the opponents (桥牌)(尤指开叫)阻击性开叫的