1. Cosmology is the scientific study of the origin, evolution, and structure of the universe.
宇宙学是研究宇宙起源、演化和结构的科学领域。

2. The discovery of the cosmic microwave background radiation was a crucial moment in the field of cosmology.
宇宙微波背景辐射的发现是宇宙学领域的一个关键时刻。