serious illness

基本解释

It has not caused any known incidents of serious illness or death in humans.
在人体内它并不会导致任何已知的严重疾病或者死亡。
When you are diagnosed with a serious illness, you are hit hard with unequivocal evidence of your physical fallibility; you can plainly see the dragon at the bottom of the well snapping its jaws.
当一个人被诊断出有严重的疾病时，他会受到自己身体状况不佳这一铁的事实的深深打击；他可以清清楚楚地看到井底的巨龙在张口磨牙。
Most health professionals have finally acknowledged that it's a real and serious illness. But we still don't know what causes it.
大多数健康专家最终承认，这是一种确实而严重的疾病。但我们仍然不知道是什么原因引起的。

CDC spokesman Christopher Cox says though the idea is well-intentioned, it is not a good way to protect against serious illness.
She lived in New York for a short time, but she was afflicted with lupus, a very serious illness, and she died at the age of 39 in 1964.
她在纽约度过一段短暂的时光，但她饱受狼疮，一种严重疾病的折磨，最终逝世于1964年。
耶鲁公开课 - 1945年后的美国小说课程节选
I had just gotten over a serious illness that I won't bother to talk about except that it had something to do with the miserably weary splitting up and my feeling that everything was dead.
我刚熬过一场重大疾病，具体就不说了,只是这与我和妻子不幸的分离有些关系,我感觉万物都没有了生机。
耶鲁公开课 - 1945年后的美国小说课程节选

Now, of course, the caution to all of this is that depression is a serious illness.
NPR: Can Botox Treat Depression Along with Wrinkles?