Security forces remained on patrol until late into the night.保安部队继续巡逻至深夜。He hurried through the rain, to the patrol car.他冒着雨急匆匆地跑到巡逻车前。The men apparently opened fire after they were challenged by a patrol.显然，那些人是在受到一支巡逻队...
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...
A burro is carrying salt of one large bag backcross a river.有一头驴子驮着一大袋子盐过河.The method can be conveniently applied to practical backcross breeding programs.该方法可以很方便地应用于实际的回交育种....