警惕: 按释义查找例句:on guard vigilant alert为了避免意外事故, 必须经常保持警惕。Constant vigilance is necessary in order to avoid accidents表情是高贵的,警惕的,自信的。Expression is noble, alert, and self-assured.你必须保持警惕,防止可能的危险。You must stay wide-awake against possible dangers.自由的代价是永久提高警惕。The price of liberty is eternal vigilance.