If you have any difficulty doing this, support the back of the head and neck on a folded blanket.

如果你做这个有难度，用毛毯来支持头和颈部的后侧。

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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。

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The main products are Confirmat screw, European screw, Square neck screw, Shelf support, and so on.

主要产品有家具螺丝，欧洲螺丝，方颈螺栓太阳能专用不锈钢螺丝，双头螺栓，板托等各种非标件。

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And the muscles in their neck, that on Earth work all day to support the head, are weak, so they can easily sprain their neck by looking to the side, too quickly.

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