跑鞋比步行鞋更需要脚掌的灵活性，以承受运动中脚跟快速落地和脚趾突然离地的动作。
The soles of shoes need more than walking shoes flexibility, to withstand the fast landing heel and toe movement from the ground suddenly action.
舞蹈病临床常见以头面部及四肢无目地不规则，快速不自主的运动，呈突然发作。
Chorea is an aimless and irregular, fast and involuntary movement of head and face, and four extremities.
内线技术动作简单、快速、突然性强，需要较强的耐抗性，优秀内线运动员以主动对抗为主；
Inside movement has the characters of simple, rapid, sudden and relatively strong resistence, so excellent player inside is mainly on initiative defence srategy.
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