Read Edit View history 第三纪 dìsānjì Tertiary Origin Definitions Defs Strokes Stroke Words Sentences Sents created sense approved 第三纪/第三紀 · dìsānjì · Tertiary 2026/03/04 第三纪 / 第三紀 dìsānjì Tertiary geological era since the extinction of the dinosaurs at the Cretaceous-Tertiary boundary 65 million years ago 第三纪时期，许多现代哺乳动物类群开始出现。 time word created sense Mar 4, 2026, 02:25 AM