Two policemen were killed when gunmen opened fire on their patrol vehicle.持枪歹徒朝警察的巡逻车开火，两名警察被打死。I think it's the thin end of the wedge when you have armed police permanently on patrol round a city.我觉得让武装警察永久性地在城市里巡逻...
除了吹得堆积起来的地方，雪只有小腿肚深。The snow, except where it drifted, was only calf-deep.珊瑚礁是由许多相同的微生物不断堆积而成。A coral reef is built by the accretion of tiny, identical organisms.路边堆积着厚厚的雪。The snow was banked up along the roadside....