在确定产品或服务的目标受众后，广告公司必须为广告选择合适的媒介。

After determining the target audience for a product or service, advertising agencies must select the appropriate media for the advertisement.

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广告媒介的选择广告代理商在确定产品或服务的目标受众后，必须为广告选择合适的媒介。

Media Selection for advertisements after determining the target audience for a product or service, advertising agencies must select the appropriate media for the advertisement.

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一旦设立完成，只需列出目标媒介类型和包含消息本身的字符串就可以发送消息了。

Once that is done messages are sent merely by listing the target mediums types and a string containing the message itself.

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