这个层(位于顶端)用于向终端用户展现可视化应用程序。

This layer (shown on top) is used to visualize applications to end users.

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终端用户不与这个层进行交互。

There will be no end-user interaction with this tier.

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应用层组播树是由终端用户构造而成，其稳定性不能得到保证。

The application level multicast tree is composed of the end hosts which can not ensure the stability of the multicast tree.

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应用层组播树是由终端用户构造而成，其稳定性不能得到保证。

The application level multicast tree is composed of the end hosts which can not ensure the stability of the multicast tree.

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