Objective: Establishing reasonable control standard of average length of stage in hospital.
目的：制定较为合理的平均住院日控制标准。
Objective To understand the Mandarin normal children average sentence length (MLU).
目的了解正常儿童普通话平均句子长度（MLU）。
Objective: Investigate the relation between average medical charge and severity rate.
目的：研究人均医疗费用与危重率的关系。
Objective: Investigate the relation between average medical charge and severity rate.
目的：研究人均医疗费用与危重率的关系。
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