大腿跟骨盆好像只有接近跪姿、蹲姿那樣彎折的時候才有折線
https://images.plurk.com/3CL2yQ399mSRbpwiX2iNzO.gif https://images.plurk.com/3XOqSR6rbqf2DThKGWoVdq.gif https://images.plurk.com/67hgNqtqghGtpuiE7kwOvB.gif