宇

例句：

1. 1. The astronauts are exploring the mysteries of the universe.
   宇航员们在探索宇宙的奥秘。
2. 2.The space shuttle is a marvel of modern technology.
   太空穿梭机是现代技术的奇迹。
3. 3.Cosmology is the study of the universe and its origins.
   宇宙学是研究宇宙及其起源的学科。