该患者无任何疾病背景、甲功正常， 心超示无器质性改变。
The patient lacked any kind of pathological background. Thyroid function was normal, and no structural alterations were seen in echo.
肿瘤治疗是有毒性的，并且往往不能耐受，这一事实要求从科学角度来更好的理解这种疾病的背景和病因。
The fact that cancer therapies were toxic and often could not be tolerated forced science to better understand the background and cause of the disease.
这些文件归纳了相应疾病和疫苗的基本背景信息，并就其在全球范围内的使用问题最后提出世卫组织的目前立场。
The papers summarize essential background information on the respective diseases and vaccines, and conclude with the current WHO position concerning their use in the global context.
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