基本上，第一个字就是首选字，而其他字对齐到最低有效字节或半字上。
Basically, the first word is the preferred word, and then the other alignments are on the least-significant byte or halfword of that word.
在FDDI的情况下，FC字段被放置在这个字段的最低有效字节中。
In the case of FDDI, the FC field is placed in the Least Significant Byte of this field.
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