If you become ill and experience severe symptoms, see your doctor.

要是你得了病并有严重症状就得去看医生。

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Unlike antibodies, cell-mediated immunity doesn't usually stop you getting ill, but it does prevent severe disease.

与抗体途径不同，细胞途径的免疫反应通常不会阻止你得病，但能够制止严重症状的产生。

youdao

Less than 20% of ill persons develop typical cholera with signs of moderate or severe dehydration.

不到20%的患者罹患典型霍乱，伴有中度或重度脱水的体征。

youdao

Labour's Baroness Turner of Camden, 83, a former trade union official, had been taken ill with severe back pains, according to Lords officials, and paramedics had been called.

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Giving them a place to stay isn't dealing with the kind of underlying issue, which is there's a very small number of people who are addicted to drugs, are mentally ill, have severe problems with alcohol, and they live on the streets and every winter they fall down drunk four times and get taken to the hospital and have to get a cat scan.

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Types of injuries which would be sent to the Royal Cornwall Hospital include chest pains, strokes, head injury with loss of consciousness, severe abdominal pain and all severely ill children.

BBC: West Cornwall Hospital