最終更新日：2024/06/26
正解を見る
The Hadean eon is considered the first era of Earth, lasting from about 4.6 billion years ago to 4 billion years ago.
編集履歴（0）
元となった例文
The Hadean eon is considered the first era of Earth, lasting from about 4.6 billion years ago to 4 billion years ago.
