Chin cup helps to position the facepiece properly.

下巴杯面罩有助于正确位置。

youdao

Neck de-tenser Lie on your stomach, elbows on floor. With eyes closed, cup chin with your left palm and support the back of your head firmly with right hand.

放松颈部动作俯身卧倒，腹部着地，双肘着地，闭上双眼，左手掌呈杯状托着下巴，右手用力扶着头后部。

youdao

Neck de-tenser4 Lie on your stomach, elbows on floor. With eyes closed, cup chin with your left palm and support the back of your head firmly with right hand.

放松颈部动作俯身卧倒，腹部着地，双肘着地，闭上双眼，左手掌呈杯状托着下巴，右手用力扶着头后部。

youdao

Neck de-tenser4 Lie on your stomach, elbows on floor. With eyes closed, cup chin with your left palm and support the back of your head firmly with right hand.

放松颈部动作俯身卧倒，腹部着地，双肘着地，闭上双眼，左手掌呈杯状托着下巴，右手用力扶着头后部。

youdao