Among the four difficulty actions, difficulty B is still the basis of single difficulty degrees while the combined difficulty D is the trend.
四种难度动作级别中，B难度仍是单个难度的基础，联合难度则以D难度连接为发展趋势。
Among the four difficulty actions, difficulty B is still the basis of single difficulty degrees while the combined difficulty D is the trend.
四种难度动作级别中，B难度仍是单个难度的基础，联合难度则以D难度连接为发展趋势。
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