U.N. aid convoys have unimpeded access to the city.联合国救援车队可以畅通无阻地进入该市。We try to negotiate a safe passage for relief convoys which will travel that stretch of road.我们试图通过谈判为将要经过那段路的救援车队争取到安全通行权。It is commonplace for snipers to open fire on aid convoys.狙击手向救援车队开枪的事很常见。