mass extinction event

短语

词形变化

mass extinction events 复数 mass extinction events

释义与例句

n.
  1. 1.

    One of five historical events in which the Earth experienced a loss of ∼75% of all species over a geological interval of less than 3 million years, the most recent being the Cretaceous–Paleogene extinction event 66 million years ago.

    地质