We must bring all positive factors into play. 我们必须调动一切积极因素。
On the teaching material, it should be widely covered and systematic with laddering nature, all factors should be applied to enrich choice of accordion songs. 教材方面,教材内容要全面系统并具有阶梯性,更要调动一切因素丰富手风琴曲目的选择。