Ulcerative colitis (UC) is characterized by a chronic relapsing intestinal inflammation. The causes of UC are unknown.
溃疡性结肠炎是一种病因未明、反复发作的肠道慢性炎症。
Background: Ulcerative colitis (UC) is a non-specific chronic inflammation of gut and its etiology has not been known clearly.
背景：溃疡性结肠炎(UC)是一种慢性非特异性肠道炎症性疾病，其病因尚不明确。
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