Studies suggest that seasonal influenza vaccines could sometimes be associated with an increased risk of Guillain-Barré syndrome on the order of one to two cases per million vaccinated persons.

研究提示季节流感疫苗有时伴有Guillain-Barré综合症大约每百万接种者1-2例，有增加的危险。

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In fact, outsourcing can control the cost, but in order to make the ideal service performance, sometimes cost may be increased on the original basis.

事实上，外包虽然可以控制成本，但为了取得理想的服务绩效，有时候也可能在原有的基础上增加成本。

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