结果217例病人得以明确病因，且采用特异性治疗，其成功率可达96%。
Results the cause of 217 cases were made clear and the specific treatment was used.
溃疡性结肠炎是一类病因尚未完全明确的疾病。
Ulcerative colitis is a kind of disease which causes are not specific.
其确切的病因和发病机制目前尚未明确。
由于病因不甚明确，故对于这些疾病的治疗也存在许多困难。
Because of unknown etiology, these diseases are difficult to treat.
其病因尚不明确。
其病因尚不明确。
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