As she turns, friction between her pointe shoe and the floor, and somewhat between her body and the air, reduces her momentum.

在她旋转的过程中，脚尖和地板的摩擦力，和她的身体所受到的空气阻力，会减少她的动量。

I had to start a video in pointe shoes.

我不得不开始穿着足尖鞋拍摄视频。