Scientists have accomplished great advances in exploring outer space.
科学家在探测外层空间方面取得了巨大的进展。
Before exploring outer space, people used to think that the earth was flat and that you could fall off the edge if you ever went that far.
在人类探索太空前，总把地球看作是平的，如果你走远了就会从边缘处落下去。
Before exploring outer space, people used to think that the earth was flat and that you could fall off the edge if you ever went that far.
在人类探索太空前，总把地球看作是平的，如果你走远了就会从边缘处落下去。
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