以下为句子列表：
英文: In left-sided pneumonectomy patients, R olumes were normal whereas L ejection fraction was abnormally low.
中文: 在左侧肺切除的患者中，R的容积是正常的，而L射血分数是异常偏低的。
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英文: Left ventricular ejection fraction (LVEF) was reported in two thirds of the group, among whom half had preserved systolic function, defined LVEF≥45%.
中文: 本组患者中三分之二的人左心室射学分数（LVEF）≥45%，其中半数的患者拥有储备收缩功能。
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英文: Summed stress scores and left entricular enlargement proided incremental prognostic information, the researchers note, but including left entricular ejection fraction did not improe the model.
中文: 研究人员注意到：负荷总分和左心室增大程度可以提供更加准确的预后信息，但是射血分数对本模型没有贡献。
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