To my mind, terrible diseases are surrogates for an alien invasion.

在我看来，可怕的疾病就是外星人的代理人。

youdao

Hitting cinemas next year, it is a film about marines fighting an alien invasion.

明年将有一部关于海军陆战队抵抗外星人入侵的电影上映。

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It could even be something truly far-fetched - an alien invasion, giant lizards or a wave of famished zombies.

甚至有可能是其它一些更光怪陆离、让人难以置信的原因——外星人入侵、巨型蜥蜴或者一批饥饿丧尸的大规模侵袭。

youdao

The game is a turn-based cover shooter, pitting your squad against an alien invasion in a variety of settings.

FORBES: 'XCOM: Enemy Unknown' Review (PC)

What leaps to the eye most impressively is our planet in ruins decades after an alien invasion so destructive that it shattered the moon.

WSJ: Oblivion: Earth, Plot in Ruins | In the House | Film Reviews by Joe Morgenstern

One theorist even floated the notion that Kennedy's limousine driver shot the president as part of an effort to cover up proof of an alien invasion.

NPR: 50 Years On, Finding Profit In 'Truth' On JFK Case