如果为零，这个例程返回并指出没有协议序列。
If so, then the routine simply returns saying that there are no protocol sequences.
首先检查协议序列的数量是否为零。
The first check that is made is to see if the count of the protocol sequences is zero.
如果Student的逾期平衡不等于零，那么在选择项组合碎片中，序列不传递任何一个消息。
If the student's past due balance does not equal zero, then the sequence skips sending any of the messages in the option combination fragment.
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