1、The preatomic model of the universe was based on the assumption that matter was infinitely divisible.
宇宙的原子模型基于这样的假设：物质是无限可分的。
2、The preatomic era in physics was marked by various theories and speculations about the nature of matter.
在物理学中，原子发现之前的时代以各种关于物质本质的理论和猜测为标志。
