第二章简单地介绍了短信业务的网络结构图。

While the second chapter introduces the map of net structure of Short Message briefly.

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其它简单的几何形状也能帮助你构图。

You can use other simple geometric shapes to help your picture composition.

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其它简单的几何形状也能帮助你构图。

You can use other simple geometric shapes to help your picture composition.

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