E2%91%A2/S%EF%BC%BF%E8%AB... · 2017. 6. 28. · such as the 100m position, the 200m position and...
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E2%91%A2/S%EF%BC%BF%E8%AB... · 2017. 6. 28. · such as the 100m position, the 200m position and the 300m position (Video -method), second was the epp method of analyzing the time