今天我们要学的词是 precautionary.
precautionary 的意思是预防性的。 Countries around the world are introducing precautionary measures to prevent the COVID-19 coronavirus from infecting their citizens. 世界各国都在采取预防措施，以防止其公民感染 COVID-19 冠状病毒。
The U.S. Federal Aviation Administration said it was barring American pilots and carriers from flying in Iraqi and Iranian airspace. Such restrictions are often precautionary to prevent civilian aircraft from being confused for ones engaged in armed conflict. 美国联邦航空管理局提出禁止美国飞行员和飞机进入伊拉克和伊朗领空。这种限制通常带有预防性质，以防民航班机被误认为是参与武装冲突的飞机。