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關注：1
2013-05-23 12:21
求翻譯：.Begin each exercise with your neck in midline position. Your head should be centered and not tilted forward, back, or to the side. You can do this exercise while either lying flat on your back or sitting up.是什么意思？ 待解決
 懸賞分：1
- 離問題結束還有
.Begin each exercise with your neck in midline position. Your head should be centered and not tilted forward, back, or to the side. You can do this exercise while either lying flat on your back or sitting up.
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