相关单词同义词hour, circle, cycle, season, day, 近义词 age, epoch, era, interval, term, time临近词periodic, perimeter, periodo, periodil, periodyl, periodate, periodide, periodize, periodcal, periodism, periodieal, periodates相似词perimeter, perinatal, perineal, perineum, period piece, periodic, periodical, periodically, 返回 period