youdao

The task also has a start node, however, this node is optional and does not change the execution semantics of the task, which can only begin execution when the input is available.

该任务也有一个开始节点，不过，这个节点是可选的，不会改变任务的执行语义，这个任务只有在该输入可用的情况下才会开始执行。

youdao

Change to the cardinality of fields in the output message, such as changing mandatory fields to optional fields, will break existing consumers.

对输出消息中的字段的基数性进行更改(如将强制字段更改为了可选字段)将中断现有使用者。

youdao