Question

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外星人对地球可分为5种，1非友好的（能提供我们所需要的帮助保护和技术），2友好的（类似低级文明保护者给我们提供保护，但是不提供技术上的帮助），3中立的（不提供任何帮助，但也不欺负我们类似过客），4，敌意的（奴役我们“可大可小”从全部奴役到部分奴役各种程度都有可能）4毁灭性的（以毁灭为乐趣的，把任何可以毁灭的物种都毁灭）
好处：科技上可以提供技术，可以改善的生活，医疗，星际旅行等可以说我们生活上的一切将的到好处。还有保护，保护我们不被其他外星人入侵。
坏处：被奴役或毁灭。奴役可分为很多种，普通的类似当时欧洲殖民时期的非洲，而高度奴役则当全部被当做奴隶。毁灭就没什么说的。

Answer 1

Alien on earth can be divided into 5 types, and the friendly (can provide what we need help protect and technology), 2 friendly (similar to low-level civilization provides protection for our protector, but don't provide technical help), 3 neutral (does not provide any help, but also not defrauded us similar traveler), 4, hostile (to enslave us "but can small" from all enslaved to part of degree are likely to enslave devastating (4 to destroy for fun, can destroy the any of the species is destruction)
Benefits: science and technology can provide technology, can improve life, medical, interstellar travel etc can say we everything in one's life will to benefits. And protect, protect us from other alien invasion.
Disadvantages: enslaved or destruction. Slavery can be divided into many kinds, ordinary similar when European colonial Africa, and highly slavery is when all was as slaves. Destruction is no say.