六级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.

它们主要是为低地球轨道（LEO）而设计的，低地球轨道是一个距离地球200到800英里的容易到达的空间区域，在那里人类可以执行哈勃太空望远镜和国际空间站（ISS）等任务。

2019年6月六级真题（第三套）阅读 Section B

六级Yet as LEO opens up to more amateur satellites, they may pose an increasing threat.

然而，随着LEO向更多业余卫星开放，它们可能构成越来越大的威胁。

2019年6月六级真题（第三套）阅读 Section B

四级Leo, why do you say English will become the world language? Hello, yes? No one knows for sure just how old kites are.

利奥，你为什么说英语将成为世界语言？喂，是吗？没有人确切知道风筝有多老。

2015年12月听力原文

四级hi, Leo, why do you say English will become the world language?

嗨，利奥，你为什么说英语将成为世界语言？

2015年12月四级真题（第一套）听力 Section B

六级This decrease in cost allows researchers, hobbyists and even elementary school groups to put simple instruments into LEO or even having them deployed from the ISS.

这种成本的降低使得研究人员、业余爱好者甚至小学团体可以将简单的仪器安装到LEO上，甚至可以从国际空间站进行部署。

2019年6月六级真题（第三套）阅读 Section B

六级There's a lot about Leo Sanchez and his farm in Salinas, California.

有很多关于利奥·桑切斯和他在加利福尼亚州萨利纳斯的农场的故事。

2019年12月六级真题（第二套）听力 Section B

六级This decrease in cost a11ows researchers, hobbyists and even elementary school groups to put simple instruments into LEO or even having them deployed from the IS The first CubeSat was created in the early 2000s, as a way of enabling Stanford graduate students to design, build, test and operate a spacecraft with similar capabilities to the USSR’s Sputnik (前苏联的人造卫星).

这种成本的降低促使研究人员、业余爱好者甚至小学团体将简单的仪器放入LEO，甚至从IS部署它们

2019.6六级真题第三套