Stay alert to serious symptoms, such as chest pain or pressure, severe shortness of breath or dizziness, or faintness, and seek medical attention immediately.

要对胸痛、胸闷、严重呼吸急促、头晕、晕厥等严重的症状保持警惕，并立即就医。

youdao

Influenza is a serious public health problem that causes severe illnesses and deaths for higher risk populations.

流感是一个严重的公共卫生问题，可在高危人群中造成严重疾病和死亡。

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And second, a more severe degree of development of the virus - is really serious and has serious negative impact both on your life and on the lives of others.

并且第二种，这种病毒的一种更为严重的新品种——真的很严重，并已对你的生活和他人的生活都产生了严重的消极影响。

youdao

"And those kids have much more serious, much more severe neurological problems.

VOA: special.2010.05.26

On the the 40th anniversary of Earth Day, this warming planet we live on is posing serious new challenges to human civilization: increasingly severe droughts, floods,and storms across the globe, and slowly rising ocean levels.

VOA: standard.2010.04.21

He said India wanted Headley tried here and that he would have possibly got a "serious and severe" sentence in this country.

BBC: David Headley: India for US Mumbai attacker's extradition

And it would need to be serious and severe damage to their ability to market and survive for a sales ban on Samsung kit to be a reasonable legal solution.

FORBES: Apple's Winning the Samsung Patent Battles And Losing The War

Shelter said 62% of complaints in the last year related to "serious and life-threatening hazards", such as dangerous gas and electrics and severe damp.

BBC: Lettings boards