The assimilation rule assimilates one sound to another by copying a feature of a sequential phoneme, thus making the two phones similar. 这句话答案说是错的,“应该是两个音或者两个音位同化。”想请问:1.这句话在星火英语和圣才的参考书上都是原话,一字不差,怎么会是错的?2.答案解析是什么意思?谢谢大家!