They believed that his cooperation with the enemy had passed over to collaboration.他们认为他与敌国的合作已演变成通敌行为。When war broke out, he was interned as an enemy alien.战争爆发时，他作为敌国人士遭到关押。Satellite technology means that enemy airwaves can be monitored more closely than ever before.卫星技术意味着可以比任何时候都更严密地监听敌国的广播。