Ming Dynasty took a policy to allow the heads from the ethnical tribes in the peripheral regions to pay tribute timely with the court's rich largess and to make some trade in Huitongguan. Thereout was

明朝曾采取允许周边各少数民族首领定期朝贡、明廷给以丰厚的赏赐并可在会同馆进行一定程度的互市贸易的政策，由此而形成明代的朝贡体制。

The two major divisions of the nervous system are the central nervous system and the peripheral nervous system.

神经系统分为两大部分，即中枢神经系统及周围神经系统．

Peripheral biotopes are relatively small, and patchy.

外围群落生境是相当小的并呈斑点状。

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