The state machine's initial state must have a single outgoing transition.
状态机的初始状态必须具有单一传出转换。
Queued applications that must keep a record of messages that have left the computer's outgoing queue can copy the messages to a journal queue.
有些伫列应用程序必须记录已离开电脑输出伫列的讯息，这些程序可以将讯息复制到日志伫列。
All incoming and outgoing materials must have a shipping receipt ;
所有进出货仓的物料必须有货单收据；
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