作为人类应用最早的信息符号和实体媒介，壁画有着久远的传播历史和演进过程。

As the earliest information symbol and entity medium applied by man, the wall picture has its own long communication history and evolution process.

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那些曾经依靠物理媒介（出版物及软件公司）或是现实和网络都涉及的实体，都正在转向纯粹的在线领域。

Entities that used to either rely on physical media (publications and software houses) or combined the real and online worlds, are making the leap to be purely online.

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在行为中被用作工具的实体。这些暗指产生输出的输入或媒介物。

Entities which are used as tools for ACTS. These could indicate inputs or intermediate objects to produce the outputs.

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