In some cases, a CT scan is absolutely required - for example, for diagnosing severe head trauma or internal injuries, for acute abdominal pain, or to diagnose an existing cancer.
在有的病例中，CT扫描是绝对必要的，例如为了诊断严重的头部创伤或内部损伤，为了诊断急腹症或者癌症的进展判断。
In some cases, a CT scan is absolutely required - for example, for diagnosing severe head trauma or internal injuries, for acute abdominal pain, or to diagnose an existing cancer.
在有的病例中，CT扫描是绝对必要的，例如为了诊断严重的头部创伤或内部损伤，为了诊断急腹症或者癌症的进展判断。
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