4th

adjective

coming next after the third and just before the fifth in position or time or degree or magnitude
第三の次にきて、第五のちょうど前の位置、時間、程度、あるいは規模
- the quaternary period of geologic time extends from the end of the tertiary period to the present
  地質年代の四次構造期間は、第三期間の終わりから現在に及ぶ

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