德国总统呼吁在圣诞节市场攻击 给假期蒙上阴影后实现团结 German president calls for unity after Christmas market attack casts shadow over holidays.

德国总统呼吁在圣诞节市场攻击后实现民族团结。 The German president called for national unity after aChristmas market attack cast a "dark shadow" over the holiday season. 他敦促德国人站在一起,强调"你并不孤单"。 He urged Germans to stand together, emphasizing that "you are not alone." 所提供的摘要中没有具体说明这次袭击的细节。 Details of the attack were not specified in the summaries provided.