degree of difficulty
柯林斯词典
1. N a rating which reflects the difficulty of the manoeuvre or action an athlete is attempting to perform in sports such as gymnastics and diving, and which is factored into the final score 难度系数; 反映体育运动中运动员欲完成动作的难度等级，如体操或潜水运动中的动作，最终分数要将难度系数考虑在内
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