[ jǐngtì ] be on guard against; watch out for; be vigilant; be on the alert 短语和例子 保持高度警惕 maintain sharp vigilance; 百倍警惕 exercise the highest vigilance; 放松警惕 relax vigilance; 丧失警惕 drop one's guard; be off one's guard; 提高警惕, 保卫祖国 heighten our vigilance and defend our motherland; 警惕敌人的破坏 be vigilant against enemy sabotage; 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.; 警惕性 vigilance