It is crucial that the upper back and neck are held in an erect position to give support for the head.
重要的是：上背和颈部要挺直以支撑头部，这一点很重要。
To lose an upright or erect position suddenly.
突然失去垂直的或笔直的位置。
Dorsal position was adopted in the first group and hugged-erect position in the second group.
第一组均采用仰卧位透视，第二组均采用抱立位透视。
Dorsal position was adopted in the first group and hugged-erect position in the second group.
第一组均采用仰卧位透视，第二组均采用抱立位透视。
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