在原子时代之前，人们还无法想象核能带来的巨大能量。

In the ___pre-atomic age, people couldn't imagine the immense power brought by nuclear energy.

前原子时代的化学理论主要依赖于观察和实验，而非现代物理学。

___Pre-atomic chemical theories relied mainly on observation and experimentation rather than modern physics.