今天我们要学的词是 drill. Drill 演习。Fire drill 火灾演练。Military drill 军事演习。Millions of people in California participated in an earthquake drill last week. 美国加州上星期有成百上千万人参加了地震演练。埃博拉病毒在美国本土的出现，让很多医院都进入备战状态。Some hospitals have had emergency drills to make sure they know what to do if an Ebola patient shows up at the door. 一些医院进行紧急演练，确保埃博拉患者一旦出现，立即启动必要程序。好的，今天我们学习的词是 drill, drill, drill...
