This task was meant to be similar to learning about animal species in a biology lesson. It used aliens in place of actual species to be certain that the participants could not draw on prior knowledge.
2
但是，告诉外星文明我们正处在地球的哪一时期并不是这个406公斤的金属球体的主要任务。
But telling alien civilizations when we lived and how Earth was in our time is not the main objective of this 406kg metal sphere.
3
例如，开普勒任务至今已经证实并宣布了7个新的外星世界。
The Kepler mission, for example, has confirmed and announced seven new alien worlds to date.
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