The birds cannot afford to relax their vigilance against predators.鳥兒不敢放松對捕食者的警戒。Constant vigilance is necessary in order to avoid accidents.為了避免意外事故,必須經(jīng)常保持警惕.Never relax your vigilance while you live in peace.你們要居安思危.We...
大壩出現(xiàn)塌方.A section of the dam has caved in.他們的房子在一次塌方中被掩埋。Their house was buried by a landslide.風暴致使薩沃納發(fā)生塌方和洪災(zāi)。The storm caused landslides and flooding in Savona....