Aliens, or even just an alien probe, could have visited Earth long ago and inserted a message into some ancestral creature.
外星人,或仅仅是一架外星探测器,可能在很久前已访问过地球,并在一些古生物中注入了讯息。
Many people believe space aliens have visited Earth in the past – if they’re not here right now.
许多人相信,外星人过去曾经造访过地球--即便他们目前不在地球上。
Many people believe space aliens have visited Earth in the past - if they're not here right now.
许多人相信,外星人过去曾经造访过地球——即便他们目前不在地球上。
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