过长的背部，腰部尤其是弱连接耦合。
Excessively long back, especially when coupled with weak loin connection.
如其他连接上、下肢的体式，头到膝式也同时作用于下背部和肩关节。
As with other poses that connect the upper and lower extremities, Janu Sirasana also affects the lower back and shoulders.
所述将上轮(2)连接至按摩轮支架的结构和方式使得能够通过按摩装置沿使用者的背部移动而使该按摩装置更好地适应使用者的背部。
This structure and manner of connecting the upper wheel (2) to the wheel support gives rise to a better adaptation of the massage device to the user's back by moving along same.
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