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 and treatment effect is not very ideal tradition.
由于病因不明，传统治疗效果并不甚理想。
The etiology of moyamoya disease is still unknown.
其病因尚不明确。
The etiology of moyamoya disease is still unknown.
其病因尚不明确。
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