Operationally, you could think intimacy as you share secrets: you share information with this person that you don’t share with anybody else.
出自-2016年12月聽力原文
The greatest concern the authors raise is space debris一pieces of "junk" that orbit the earth, with the potential to cause serious damage if they collide with operational units, including the ISS.
2019年6月六級(jí)真題（第三套）閱讀 Section B
Whether the separation distances involved would satisfy air-traffic-control regulations is another matter although a working group at the International civil Aviation Organisation has included the possibility of formation flying in a blueprint for new ope