(1)1千3百万年前から2百年前まで
(2)造山運動
(3)気候の冷却
(4)哺乳類の増加と巨大化
(5)cooling of climate
さらに詳しく
(1)輪郭が明快なこと
(2)clarity of outline; "exercise had given his muscles superior definition"
