英语翻译

题目

英语翻译
Hence,additional media should be used only if they make a significant and relevant contribution in the transmission of a message.Otherwise,they can distract and interfere in many ways with the users' ability to perform their tasks.

答案

因此,额外的媒介必须仅仅用于当它们能够给消息传递作出巨大的相关贡献的时候.否则,它们（指额外的媒介）就会以多种途径分散并干扰用户完成他们的任务的能力.