然而，二胡演奏时，弓毛是在两个弦之间运动。
However, in the case of erhu, the horse hair runs between the two strings.
从物理分析的视角出发，以力矩平衡原理、弦振规律分别对二胡演奏中的运弓及左手指位进行了分析，定量地讨论分析了“乐感”中的力度和音准问题。
In the musical performance rule of ErHu, how to use bow and finger of left hand is analyzed, that is based on the moment balance principle and bowstring principle.
换句话说，二胡的弓不能从弦中离开，除非这两根弦中有一根卸下或断了。
In another word, one cannot take off the bow from the instrument unless one of the two strings is taken off or broken.
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