在下面这句话中：‘But secondly,the great endeavor of the Metropolitan

在下面这句话中：‘But secondly,the great endeavor of the Metropolitan Police at this time is the roll out of community policing which we are putting into every ward across London during the course of this year.’的roll的意思是什么?这句话的意思是：“其次，首都警察局在这一时期要尽最大努力展开社区治安监督工作，今年我们要把这一措施推广到伦敦的每一个行政区。”roll在这句中应该是个名词，我个人认为它不与后面的'out of community policing'组成词组，但不太清楚自己的想法对不对，希望朋友可以帮我解答。