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.
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.
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