Sit in any comfortable posture with back, neck and head in one line.
选择任何舒适的坐姿，背部，颈部，头成一条直线。
It lies between the roll line and neck edge to help the collar roll correctly.
它处于领折线与领圈之间，有助于衣领的正确翻折。
Keep the head, neck, and sping in the straight line.
保持头部，颈部脊柱在一条直线上。
Keep the head, neck, and sping in the straight line.
保持头部，颈部脊柱在一条直线上。
应用推荐