While at work, sit upright, with a straight-back, in your chair.
工作时可以坐直，坐在椅子上要挺直腰杆。
Use from birth until baby is able to sit upright unassisted.
从出生婴儿的使用，直到能够坐在直立无辅助。
Ask the patient to sit upright and still, holding the head straight.
要求患者坐直、静止，头部扶正。
The last place a child would sit to read is an upright chair.
孩子读书最不愿意坐的地方是直挺挺的椅子。
Choose an upright chair and sit well back so that your spine is straight.
挑一把竖直的椅子，坐好，保持脊椎的挺直。
站直或坐直。
The nursery teacher made the children sit bolt upright.
幼儿园的老师让孩子们笔直地坐着。
He made the children sit bolt upright.
他让孩子挺胸坐直。
坐在一张直背椅。
坐在一张直背椅。
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