长难句：1.The words used by the speaker may stir up unfavorable reactions in the listener which interfere with his comprehension; hence, the transmission-reception system breaks down.

结构剖析：本句有分号分为两部分，其中第一部分的主干是 The words....may stir up unfavorable reactions....., which 引导的定语从句 which interfere with his comprehension 修饰 reactions.(这点很重要,注意理解) 过去分词 used by the speaker 作 words 的后置定语，介词词组 in the listener 作 reactions 的后置定语