一个悬空输入，如果它是某个活动或网关的控制输入、某个活动的数据输入，或某个活动必需的数据输入，那么它会导致死锁。
A dangling input causes deadlocks if it is a control input of an activity or a gateway, a data input of a gateway, or a required data input of an activity.
流程模型中出现的一个常见现象是悬空输入和输出，即模型中保持未连接状态的活动或网关的输入和输出。
A phenomenon that we often observed in process models is the occurrence of dangling inputs and outputs, i.e., inputs and outputs of an activity or gateway that remain unconnected in the model.
join中的悬空输入，会使join无法执行，并因此阻塞后面的所有活动。
The dangling inputs in the join prevent it from executing and thus block all activities succeeding it.
不幸的是，悬空输入往往会导致模拟错误，甚至会使模拟根本无法运行，因为活动或网关一直在等待某个永远不会接收到的输入。
Unfortunately, dangling inputs are often the source of simulation errors or prevent the simulation from running at all, because an activity or gateway waits for some input that it can never receive.
将未释放到流程输出接口的的活动数据输出连接到某个结束或停止节点，以避免出现悬空输出。
Connect data output of activities that are not released to the process output interface to an end or stop node to avoid dangling outputs.
将未释放到流程输出接口的的活动数据输出连接到某个结束或停止节点，以避免出现悬空输出。
Connect data output of activities that are not released to the process output interface to an end or stop node to avoid dangling outputs.
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