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1. understaffed adj. 人员不足的, 人手不足的
2. nursing n. 看护, 养育
3. variable n.可变因素，变量
4. categorize vt.分类
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60秒科学:护士越少,患者死亡率越高
时间:2011-03-22 10:45:16 来源:scientificamerican 编辑:sunny 每天三分钟英语轻松学
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