Northern Ireland was on edge after Belfast erupted in violence following a brutal stabbing attack in the city this week. 在一起残忍的持刀袭击事件导致贝尔法斯特爆发暴力骚乱后，北爱尔兰陷入紧张局势。 The case has ignited simmering anti-immigrant sentiment. Far-right figures have called for crowds…