Researchers at small labs or at institutions focused on teaching arguably have the most to lose when sharing hard-won data.
2017年12月六级真题(第二套)阅读 Section B
There is no doubt that spaceflight entails risks, and to pioneer a new mode of travel is to face those risks, and to reduce them with the benefit of hard-won experience.
2015年12月六级真题(第二套)阅读 Section C