hard cosmic ray

例句：

1. 1. The hard cosmic rays are the most energetic particles in the universe.
   硬宇宙射线是宇宙中最活跃的粒子。
2. 2.Astronomers have detected a new type of hard cosmic ray that could explain the origin of the universe.
   天文学家已经探测到一种新型的硬宇宙射线，这可能解释了宇宙的起源。
3. 3.Hard cosmic rays are believed to be responsible for the radiation background observed by astronomers.
   硬宇宙射线被认为是天文学家观察到的辐射背景的原因。