US planes clashed with enemy fighter aircraft again today.美国飞机今天又与敌方战斗机发生了冲突。The new fighter aircraft flies almost twice as fast as the old one.这种新式战斗机飞行速度比老式的几乎快一倍。The circuitry in this fighter aircraft has been protected against strong magnetic fields.这架战斗机的电路系统有防护装置，不会受强磁场的干扰。