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thank you guys!i finally fix it by chance.......it is the problem of parameter datatype,which is not suitable for the function,which is pcl::VoxelGrid<sensor_msgs::pointcloud2>,if i replace sensor_msgs::pointcloud2 with pcl::pclpointcloud2,it will be all right!although some part of tutorial demonstrated that sensor_msgs type is all right, in my situation it is not.......i don't know whether the tutorial got some mistakes.