对以下语段进行润色：Generally according to whether participants need to participate actively the task allocation model of MCS can be divided into participatory-sensing-based and opportunistic-sensing-based If t

The task allocation model of MCS can generally be divided into participatory-sensing-based and opportunistic-sensing-based, depending on whether participants need to actively participate. In the offline mode, tasks are assigned before the MCS task execution, while in the online allocation mode, task allocation is performed while the MCS task is running.