[] the process of sth becoming no longer useful or able to be used because it has been used for a long time破损◆research into wearout and failure in car engines对汽车引擎的破损和失灵进行研究 () the situation when an advertisement has been shown so many times that it is no longer useful as people are now bored or annoyed with it（广告）疲乏，失效◆Advertising wearout can be avoided by varying the way in which the basic message is presented.广告疲乏可以通过改变基本信息的呈现方式加以避免。