UN Special Envoy for Syria Staffan de Mistura says the attackshows the importance of gaining a settlement in Syria. "________________." The U.S. embassy in Brussels has recommended Americans stay where they are and avoid publictransportation in the Belgian capital. 联合国叙利亚问题特使斯塔凡-德米斯图拉表示此次袭击表明了叙利亚安定问题的重要性.____________美国驻布鲁塞尔大使馆建议在比利时首都的美国公民不要随意走动并避免乘坐交通工具.
