Three months earlier, everyone Harrison had ever know, and every trace of civilization, had flashed out of existence. He had watched it happen. There had been no warning, no obvious cause. In three months, no other survivors had made themselves known.
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Often there is no obvious cause.
哭闹经常无明显原因。
There was no obvious cause of gastrointestinal infection and history of gut diseases.
没有明显的胃肠道感染诱因，并且既往无胃肠道疾病史。
Petrous ICA aneurysms can be traumatic or mycotic in origin, but in the majority of cases, there is no obvious cause, and such lesions are considered congenital in origin.
颈内动脉岩段动脉瘤可以是创伤或真菌感染所致，但在大多数病例中，没有明确的病因，通常被认为是先天性。
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