整个背贴着躺在地上，脚板放平在地板上，两手放在身体两侧。
Lie on your back, feet flat on the floor, knees bent, hands at your sides.
现在选一侧，开始在那边，旋转到你的背。
Now pick a side, start on that side, and rotate to your back.
腹侧通路与背侧通路是视觉加工的两条通路。
However, the role of the dorsal pathway in reading is complex.
小指尺侧无指固有神经背侧支。
拇指背尺侧动脉无紧密伴行的静脉。
The dorsoulnar artery of thumb had no closed veins to accompany with.
直背枷锁侧褶。
直背枷锁侧褶。
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