在TRUNK上NativeVLAN的数据是无标记的(Untagged),是指如果TRUNK失败的时候端口上仍然能正常工作的VLAN，在这指定在NativeVLAN为999，表明VLAN999为不用打标签的VLAN。
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英语被动句有有标记的和无标记的两种。
There are two kinds of passive sentences in English: marked and unmarked.
它也可以由有标记的句子或无标记的句子来表示。
Vietnamese also have passive sentences that may have the signal sentence or the non-signal sentence expressed.
据发现，英语阳性人称名词往往是无标记的，阴性人称名词是有标记的。
It is discovered that in English, personal masculine nouns tend to be unmarked while personal feminine nouns are always marked.
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