Read Edit View history 级数 jíshù series Origin Definitions Defs Strokes Stroke Words Sentences Sents created sense approved 级数/級數 · jíshù · series 2026/03/04 级数 / 級數 jíshù series (math.) series 这是一个无穷级数。 noun created sense Mar 4, 2026, 02:25 AM