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单词 proto-Earth
释义

Definition of proto-Earth in English:

proto-Earth

noun
Astronomy
  • The earth at an early stage of its development.

Origin

1950s; earliest use found in Science.

Definition of proto-Earth in US English:

proto-Earth

noun
Astronomy
  • The earth at an early stage of its development.

Origin

1950s; earliest use found in Science.

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