他们研究表明，对那些病情最恶劣的患者来说，一个额外的质量生命年的平均成本则更加昂贵—48万美元。
Their study showed that for the sickest patients, the average cost of an additional quality-of-life year was much higher — $488, 000.
研究表明年轻人仍然指望父母作为他们主要的健康信息来源。
Research shows that young people still look to parents as their main source for health information.
他们说，她的研究甚至没有表明这种细菌能在野外生存，更不用说杀死大量植物了。
They say that her study doesn't even show that the bacteria would survive in the wild, much less kill massive numbers of plants.
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