The price of liberty is eternal vigilance. 自由的代價是永久提高警惕。
Eg.We must step up our vigilance. 我們一定要提高警惕。
Sniping may be a problem and senior officers must exercise due care when travelling about their areas. 放冷槍進行暗算可能是個大問題，所以高級軍官路經他們地區時必須小心防範。
I slid back the panelled sides, got in with my light, pulled them together again, and felt secure against the vigilance of Heathcliff, and everyone else. 我推開嵌板的門，拿著蠟燭進去，把嵌板門又合上，覺得安安穩穩，躲開了希刺克厲夫以及其他人的戒備。
Police's vigilance was eventually rewarded. 警方時時警戒終有所獲。
Eternal vigilance is the price of liberty. 自由的代價乃是永恆的警戒。
