The Classifier rule: We will create the UserLevel classifier rule, which classifies the user based on the balance in theiraccount.
分类器规则：我们将创建UserLevel 分类器规则，它根据用户账户上的余额对用户进行分类。
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.
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.
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。
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