As a side-line system, the folk drama including mime 、 harlequinade 、 improvised comedy 、 acrobatics and circus is so mighty and plentiful that the orthodox drama always absorbs the new strength and vitality from it. 丑角哑剧、即兴喜剧、杂技、马戏、歌舞杂耍等诸多民间戏剧形式,作为戏剧强大而丰富的附属系统,是正统戏剧吸取力量与生命力的源泉。