pre-emption
n[U]
1 (fml 文)
(a) purchase by one person, group, etc before others have the chance to buy 优先购买.
(b) right to do this 优先购买权.
2 obtaining or preventing (sth) by acting in advance 抢先行动以占有或阻止(某事物).
A telescope would have to be as far away as the planet Jupiter to look for life in outer space, because the dust becomes thinner the further we travel towards the outer edges of our own solar system.