他们有多种选择机会，有着不同的接触媒介的阅读动机。
They have the multiple options opportunities, has the different contact medium reading motive.
联合多种信号通过单一的媒介来传输的装置。
A device that combines several signals for transmission over a single medium.
联合多种信号通过单一的媒介来传输的装置。
A device that combines several signals for transmission over a single medium.
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