This flattens the arch and makes it drop.
这会使足弓变平且脆弱。
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。
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；
应用推荐