He flicked ash from his cigaret onto the cobblestones.
他把香烟的灰烬弹

石上。
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Also, another distinction from ulcerative colitis is that these areas of inflammation are scattered as opposed to being continuous, and have areas of healthy tissue interspersed between inflamed areas, this gives it a " cobblestone appearance" .
与溃疡性结肠炎的另一个
别是克罗恩病的炎

是分散的,而溃疡性结肠炎的病灶则是连
性的;克罗恩病的炎
病灶之间有散在的

织
,这就形成了“铺路石样外观”。