But neither do they easily stop the movement of terrorists, warlords, small arms, smuggled people, refugees, narcotics, infectious diseases and environmental hazards.
同时国境线也无法轻易地阻止恐怖主义分子、军阀、小武器、偷渡人口、难民、麻醉品的移动和传染病及环境灾害的传播。