Ball circumference device 球周长检测器
The waistline and thigh circumference are the main factors that affect the ball speed of frontal header.
腰围和大腿围是影响双脚跳起正面头顶球球速的主要因素。
However, not only thigh circumference, waistline, neck circumference and body weight are the main factors that effect the ball speed of side header, but hip circumference is correlative.
对双脚跳起侧面头顶球技术影响的主要因素是大腿围、腰围、颈围和体重，而臀围相关性也较高。
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