来源：
http://hi.baidu.com/copyearth/item/8a7b4512eb28be0cb88a1a54

担忧：史蒂芬·霍金曾警告外星人可能为了资源而侵略地球。
　　Scientists are divided about whether we should be advertising our presence to inhabitants of other planets.
　　科学家对于是否应该告知外星人我们的存在有着很大分歧。
　　Some say that if we alert hostile aliens to our existence we risk an invasion that could lead to the end of life on Earth.
　　如果对有敌意的外星人透露我们的存在，很可能会招致大规模入侵最终造成人类的灭亡。
　　They argue that if ET has the technology to cross space to reach us any defences we have will be all but useless.
　　科学家们还称如果外星人拥有穿越太空的技术来到地球，那么任何防御措施都不会起作用。
　　And Stephen Hawking has warned that aliens may plunder Earth for its resources.
　　史蒂芬·霍金曾警告外星人可能为了资源而侵略地球。
　　Advocating that we do everything we can to avoid contact, he said: ‘We only have to look at ourselves to see how intelligent life might develop into something we wouldn’t want to meet.
　　支持避免与外星人接触的霍金说：“看看我们自己，就知道我高智能生物是如何进化成我们不想看到的结果。”
　　‘If aliens visit us, the outcome would be much as when Columbus landed in America, which didn’t turn out well for the Native Americans.’
　　“如果外星人来访，结果会如同哥哥伦布发现美洲大陆差不多，美洲原著居民下场可不是那么好。”