noun, noun which may take the genitive case particle 'no'
spontaneous generation; abiogenesis
Biology term for the now-discredited theory that living organisms arise from nonliving matter.
自然発生説はパスツールの実験によって否定された。
The theory of spontaneous generation was disproved by Pasteur's experiments.
noun, noun which may take the genitive case particle 'no'
natural occurrence; spontaneous occurrence
General use for something arising naturally without external cause.
この地域では地震の自然発生が多い。
Earthquakes occur naturally and frequently in this region.