边境部队提高警戒,以防局势突然失控。Biānjìng bùduì tígāo jǐngjiè, yǐfáng júshì tūrán shīkòng.The border troops heightened their alert to prevent the situation from suddenly getting out of control.
守夜的人整晚都在村口警戒,不敢睡觉。Shǒuyè de rén zhěng wǎn dōu zài cūnkǒu jǐngjiè, bù gǎn shuìjiào.The night watchman stood guard at the village entrance all night and did not dare to sleep.
天气太干了,护林员要时刻警戒山火。Tiānqì tài gān le, hùlínyuán yào shíkè jǐngjiè shānhuǒ.The weather is too dry, so the forest rangers must stay constantly alert for wildfires.