那叫二胡，是一种用弓演奏的琴。
摘要：二胡演奏中，运弓的力度是表现音乐情绪，抒发情感的一种技法。
Abstract: erhu performances, Yun arch music performance is the intensity of emotions, a technique to express emotion.
另外，二胡有一个杯形状的琴筒和用马尾制成的弓。
In addition, there is a cup-shaped canister and a bow made of horsehair.
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.
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.
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.
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.
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