Some low blood heft the case and not obvious cause of disease.

有些低血掂病例并无明显病因。

youdao

The infarct-like lesions in the cerebellum are "silent, "meaning that they did not cause obvious clinical symptoms inthe study participants.

小脑的栓塞样损伤是“静悄悄”的，也就是说，它在研究的参与者中没有明显的临床症状。

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The colon lymphoma mainly infiltrate the submucosa and deeper layers and may cause prominent colonic wall thickening, but lumen stenosis is not obvious.

结肠淋巴瘤主要是沿黏膜下层向深层浸润，可引起显著的肠壁增厚，而肠腔狭窄常不明显。

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Police said a post-mortem examination had not found any obvious cause of death and further tests would be held.

BBC: East Ashling death: Victim named as Debbie Levey

Early ovarian cancer may not cause obvious symptoms - but as the cancer grows symptoms may include a swollen or bloated abdomen, constipation, pressure in the abdomen and fatigue.

BBC: Northern Ireland women 'slow to recognise ovarian cancer'

The case for pan-European action against depleted-uranium weapons is less obvious, not least because the evidence that the weapons do cause cancer is disputed.

ECONOMIST: The European Union