Since the system doesn’t have to calculate the relative positions of the fingers, palm and back of the hand on the fly, it can be extremely quick, claim the researchers.

研究人员声称，由于系统不需要对舞动中的手指、手掌和手背位置进行计算，因此处理的速度会极其迅速。

youdao

Use your hand to power the hoop in a back-and-forth motion: the hoop will alternate between hitting the center of your palm and the back of your hand.

用你的手来给呼啦圈前后移动的力：呼啦圈会在你的手掌心和手背上交替着力。

youdao

The driver sprang from behind the wheel and, pressing the palm of his hand to the woman's mouth, half carried, half dragged her back to the car and folded her body into the back seat.

NPR: Excerpt: 'Legends'