1. The dog kept a vigilant guard over the house.
    这只狗警醒地守护着这所房屋。

2. A vigilant police force helps to control crime.
    一支警惕着的警察队伍有助于遏制犯罪。

1. 警惕的：48. malignant 恶意的 | 49. vigilant 警惕的 | 50. omnipotent 全能的, 万能的

2. 警戒,注意的：vigilance 注意,警戒,警惕 | vigilant 警戒,注意的 | vigor 生气,精力充沛的

3. 警惕的 alert 警惕的：324 vast 宽广的,巨大的 large 巨大的 | 325 vibrate 震动 convulse 震动 | 326 vigilant 警惕的 alert 警惕的

1. 警惕的;警觉的；警戒的
    Someone who is vigilant gives careful attention to a particular problem or situation and concentrates on noticing any danger or trouble that there might be.

    e.g. He warned the public to be vigilant and report anything suspicious...
           他警告公众要提高警惕，遇到任何可疑情况都要报告。
    e.g. All but one of these letter bombs had been intercepted by vigilant post office staff.
           除了一封漏网之外，警惕的邮局员工截获了其余所有的邮件炸弹。

1. carefully observant or attentive
    on the lookout for possible danger

    e.g. a policy of open-eyed awareness
           the vigilant eye of the town watch
           there was a watchful dignity in the room
           a watchful parent with a toddler in tow

    Synonym: argus-eyedopen-eyedwakeful