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Some communities have agreed to share online—geneticists, for example, post DNA sequences at the GenBank repository ( ' , 库), and astronomers are accustomed to accessing images of galaxies and stars from, say, the Sloan Digital Sky Survey, a telescope that has observed some 500 million objects—but these remain the exception, not the rule.
出自-2017年6月阅读原文
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Some communities have agreed to share online—geneticists, for example, post DNA sequences at the GenBank repository 库, and astronomers are accustomed to accessing images of galaxies and stars from, say, the Sloan digital Sky Survey, a telescope that has o
2017年6月六级真题（第一套）阅读 Section C
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They're primarily designed for Low Earth Orbit(LEO) an easily accessible region of space from around 200 to 800 miles above Earth, where human-tended missions like the Hubble Space Telescope and the International Space Station(ISS) hang out.
2019年6月六级真题（第三套）阅读 Section B