Standard test method for shock - absorbing properties of playing surface systems and materials 运动表面系统和材料减震性能的标准试验方法
2.
Yoga exponents are being caught out by the activity ' s relaxing and low impact image with more than one in four injured during sessions 瑜珈的倡导者们被这项运动表面上轻松、低强度的特点所蒙蔽，其实在练习过程中，有超过1 / 4的瑜珈练习者受过伤。
