以下为句子列表：
英文: In the nitrous oxide group,the puerperants deeply i nhaled the Nitrous oxide that premixed with oxygen(0 %∶0 %) times before uterus systoling 0 s,then loosed the pneusis device,and conducted the seco nd inhaling before uterus systoling by 0 s.
中文: 再次宫缩前 ～ 0 s,再次吸入 ,如此反复 ,至胎儿娩出。
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英文: Results: Linear correlation analysis: Except the markers of embryocardia Y , fetus pneusis Y , amniotic fluid Y , between every two markers of the rest are assumed to be linear correlation.
中文: 逐步回归分析前进法表明，以F= .98作为选入变量的界值，以F=.90作为剔除变量的界值，孕周X、痛经X、文化程度X、母亲体重X进入Z的回归方程，见表0，表；
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