用户可以查看执行的状态、输出参数和结果集。
Users can view the status of the execution, output parameters, and result set.
活动框架代表了当前的状态，并通过使用输入和输出针脚来允许添加活动参数。
An activity frame represents current activity and allows adding activity parameters by using input or output pins.
如果计算所得的降水像素超出阈值参数，则退出循环并输出“raining”状态。
If enough precipitation pixels have been counted to exceed the threshold parameter, exit the loops and write the "raining" status.
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