So imagine scientists' surprise in the mid-1990s when they found these powerful gamma ray flashes happening right here on Earth, in the skies overhead.
因此可以想像一下,当科学家在九十年代中期发现伽马射线闪光竟出现在地球上,并就在我们的头顶上出现时,是多么的惊喜。
But three of these astronauts are due to return to Earth next month, and the rest are scheduled to come back in mid-November.
但由于其中三名宇航员在下个月要返回地球,其他的宇航员也计划在11月中旬返回。
148Scientists studying historical weather patterns have discovered that in the mid-sixth century, Earth suddenly became significantly cooler.
148研究历史上气候变化的学者发现在六世纪中叶,地球突然变冷了很多。
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