inexpensiveboard:火车来了,等在月台上的人们准备上车。are not supposed todestination image reduced:reduce sth. to sth.将什么概括成,简化成。。cut to在这里应该是(电影等)转换(画面)的意思,不符challengeconnected:be connected with有关联的,产生联想,其实这个让我很痛苦。associate的意思跟它差不多,甚至connect这个意思的英文解释就是associate。我不确定。representedanalogy :draw an analogy between A and B:将两个进行类比比拟。题中是讲水波与光波进行类比