era

時代

特定の出来事や人物、暮らし方で特徴づけられる長い期間。

やさしい英語で： A long period of time known for particular events, people, or ways of life.

• We live in a digital era.
• The railway marked the beginning of a new era.
• These paintings come from different eras.

使い方： era of something (The invention began an era of rapid change.)

類義語： age, period, epoch

よく使う表現： a new era, digital era, Victorian era

地質時代、代

何百万年もの間にできた岩石に記録される、地球の歴史の大きな区分。

やさしい英語で： A major division of Earth's history, represented by rocks formed over many millions of years.

• Dinosaurs lived during the Mesozoic era.
• These rocks formed in an earlier geological era.
• Scientists divide eras into smaller periods.

よく使う表現： Mesozoic era, geological era, Paleozoic era