边境地区在暴风雪后加强戒备,以防补给线再次中断。Biānjìng dìqū zài bàofēngxuě hòu jiāqiáng jièbèi, yǐ fáng bǔjǐ xiàn zàicì zhōngduàn.After the blizzard, the border region strengthened its state of alert to prevent the supply line being cut again.
小狗对陌生人一直很戒备,总是躲在沙发后面。Xiǎogǒu duì mòshēngrén yìzhí hěn jièbèi, zǒngshì duǒ zài shāfā hòumiàn.The puppy has always been wary of strangers and keeps hiding behind the sofa.
夜里小区加强了戒备,保安每个小时都要巡逻一次。Yè lǐ xiǎoqū jiāqiáng le jièbèi, bǎo'ān měi ge xiǎoshí dōu yào xúnluó yí cì.At night the neighbourhood tightened its vigilance, and the guards patrol once every hour.