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....
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...