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.
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