Read Edit View history 震旦纪 zhèndànjì Sinian Origin Definitions Defs Strokes Stroke Words Sentences Sents created sense approved 震旦纪/震旦紀 · zhèndànjì · Sinian 2026/03/04 震旦纪 / 震旦紀 zhèndànjì Sinian Sinian (c. 800-542 million years ago), late phase of pre-Cambrian geological era 震旦纪是地球历史上一个重要的地质时期。 time word created sense Mar 4, 2026, 02:25 AM