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 難度系數; 反映躰育運動中運動員欲完成動作的難度等級，如躰操或潛水運動中的動作，最終分數要將難度系數考慮在內
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