This flattens the arch and makes it drop.

这会使足弓变平且脆弱。

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The influencing factors of coal arch camber in planomural coal bin and coal drop pipe with rectangular or circular cross section during coal drop are studied theoretically.

对落煤过程中平壁煤仓及截面形状分别为矩形、圆形的落煤管起拱的影响因素进行理论研究。

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To arch the neck and stimulate the cervical spine, lengthen the neck, drop the head back, lift the chin, and open the throat;

弯曲颈部并刺激颈椎，拉伸颈部，头向后仰，抬高下巴，打开喉咙；

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To arch the neck and stimulate the cervical spine, lengthen the neck, drop the head back, lift the chin, and open the throat;

弯曲颈部并刺激颈椎，拉伸颈部，头向后仰，抬高下巴，打开喉咙；

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