十多年来,全国各地已经研制出了多种机械结构的二胡双千斤。这些双千斤在实践中取得了不同程度的演奏效果,但有些问题尚未得到彻底的解决。比如;有的拇指用力方式不理想;有的关锁不牢,不同步;有的。只能在乐句间隙进行操作等等。这些问题都 For more than a decade, various erhu pairs of mechanical structures have been developed across the country. These double kilos have achieved varying degrees of performance in practice, but some problems have not yet been completely solved. For example; some thumbs are not ideal way; some lock is not strong, not synchronized; some. Only in the phrase gap operation and so on. These problems are all