1. Topochemistry is a branch of chemistry that focuses on the study of the relationship between the structure of a molecule and its properties.
拓扑化学是化学的一个分支，主要研究分子结构与其性质之间的关系。

2. The use of topochemistry has greatly contributed to the development of materials science.
拓扑化学的应用对材料科学的发展做出了重大贡献。