压力无疑加剧了她的病情。

Stress has undoubtedly contributed to her illness.

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Stress has undoubtedly contributed to her illness.

undoubtedly 由前缀 un-(表示"不")和动词 doubt(怀疑)加上副词后缀 -ly 构成。字面意思是"不可怀疑地",即"毫无疑问地、确实地"。

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