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。