原げん子し時じ代だい

noun

atomic age; atomic era

Refers to the historical period beginning with the development and use of atomic weapons and nuclear energy, often associated with the mid-20th century onward.

• 原げん子し時じ代だいの到とう来らいは世せ界かいを大おおきく変かえた。

  The arrival of the atomic age changed the world dramatically.