(1)紀の下位区分で、それ自体は期に分割される、地質年代の単位
(2)a unit of geological time that is a subdivision of a period and is itself divided into ages
さらに詳しく
(1)敵をかわすための行動
(2)an action aimed at evading an opponent
(1)全てが一定で変化のない状態
(2)a condition in which everything is regular and unvarying
