中太古代

Zhōngtàigǔ Dài
  1. (geology) the Mesoarchean era (part of the Archean eon, spanning from 3.2 to 2.8 billion years ago)
  2. the Mesoarchean era (part of the Archean eon, spanning from 3.2 to 2.8 billion years ago)

Wiktionary

Entry Composition

=1 中 Zhōng
  1. (bound form) China; Chinese
  2. surname Zhong
=1 中 zhōng
  1. within; among; in
  2. middle; center
  3. while (doing sth); during
  4. (dialect) OK; all right
=1 中 zhòng
  1. to hit (a target)
  2. to be struck by (a bullet, illness etc)
  3. to win (a prize or lottery)
2 太古代 Tàigǔdài Archaeozoic (geological era before 2500m years ago)