纵向中心线 longitudinal centerline ; Oy-Oy
双向中继线 BWT BothWayTrunk ; [通信] both-way trunk line ; two-action trunk ; bothway trunk
单向中继线 [通信] one-way trunk ; onion skinning ; [通信] single action trunk
向背中线 dorsomedial ; dorsimesad
可变向中心车道线 reversible center lane line
横向力中性线 [车辆] neutral line of lateral force
径向中心线距离 radial distance from centerline
转向节旋转中心线 knucklepivotcenter
专线双向中继电路 private line two-way trunk circuit
插图：骶棘肌上提躯干，同时菱形肌将肩胛骨向中线拉。
Inset: the erector spine muscles lift the torso and the rhomboid draw the scapulae towards the midline.
菱形肌收缩肩骨，使其向中线的方向靠拢，从而打开胸廓。
The rhomboids retract the scapulae, drawing them towards the midline and opening the chest.
让脸上的皮肤放松离开中线沉向耳朵的方向，头两侧的皮肤则沉向地板的方向。
Allow the skin of the face to release away from the midline and fall towards the ears and the floor on either side of the head.
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