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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。
youdao
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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。
youdao
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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。
youdao