Mild illnesses settle quickly with your own efforts, but more severe illness is something you have little or no ability to fight without professional help and medication.

病症较轻的可以较快的靠自己的努力恢复，但是较重者没有专业药物和帮助的情况下，你没有或只有极少的抗争能力。

youdao

Since her chemotherapy for ovarian cancer, Bobbie lost most of her hair, but more damaging, she has severe neuropathy in her left hand and both feet.

自从博比因卵巢癌做了化疗后，她几乎掉光了头发，但更糟糕的是，她的左手和双脚还患上了严重的神经病症。

youdao

You might have that commonly, but even more severe than normal aches and a rash.

你们可能经常有过那种经历，但比正常的疼痛和皮疹更严重。

youdao

But so far the virus has not shown itself to be more severe than seasonal flu.

VOA: special.2009.08.05

You might have that commonly, but even more severe than normal; aches; and a rash.

你们都有过这种经历,有时也许比平常的更加严重,疼痛,皮疹

耶鲁公开课 - 生物医学工程探索课程节选

But the virus has yet to show itself to be more severe than seasonal flu.

VOA: special.2009.08.18

Others showed the same gene causes a similar but more severe inflammatory syndrome that begins in infancy.

FORBES: The Ultimate Targeted Therapy

That would make it more benign than the Great Depression of the 1930s but more severe than the Great Recession of the 1970s.

FORBES: There's Something About Harry

Last week Timothy Geithner, the Federal Reserve's man on Wall Street, gave warning that all this might make financial crises less common, but more severe.

ECONOMIST: Financial markets