To loosen your quadriceps , stand up , grab a foot behind your back , and pull that foot to your butt , keeping your knee pointed at the ground （ figure 6 ） 伸展肩膀的另一种方法，把手臂往后拉，拇指朝上，手掌压在墙上或石壁上，感觉整只手及肩感受到伸展（图四） 。
3.
For the convenience of calculation , ascending branch was simplified into a direct ratio formula and descending branch was simplified into two straight lines divided by knee point 从方便计算的角度上建议上升段采用比例方程表示，下降段简化为以拐点分界的两部分直线。
4.
The whole tension strength of steel fiber reinforced self - stressing concrete is a combination of tension strength of matrix and the self - stress value ; the strain of knee point is defined to 500 10 ^ ( - 6 ) , and a formula for stress of knee point is suggested 钢纤维自应力混凝土抗拉强度为混凝土基体的抗拉强度与自应力值之和；曲线下降段拐点的应变定义为500 10 ^ ( - 6 ) ，并提出拐点应力计算公式。
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