It's often the case that the obvious cause of the problem isn't the true source.
情况往往是这样：某问题显著的原因并非是其真正的源头。
Look for an obvious cause of the injury such as poorly fitting equipment or a missed step while sprinting.
查找引发创伤的原因，例如安装不良的设备或疾跑时发生踏空。
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。
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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