For the majority of people, swine flu is a minor illness.

对大多数人来说，猪流感是小病。

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He told him that heart trouble was never a minor illness, but that wasn't a serious heart attack.

他告诉病人心脏病从来不是一种小病，但是也不是严重的心脏病发作。

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The study advises doctors to only prescribe placebos if the patient has a minor illness and if it seems likely that a placebo treatment will be successful.

该调查对此建议医生仅对那些患有小病和安慰剂能起到有效作用的病人使用安慰剂。

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The ED will also house a Minor Injuries Unit (MIU) and a larger major injury or illness area containing a resuscitation room with capacity for five patients facing life threatening illnesses or injury at one time.

BBC: Ysbyty Glan Clwyd: Emergency department work begins