想知道英语单词的准确音标

问题描述:

想知道英语单词的准确音标
哪个发/s/的音?那个发/z/的音,哪个发/iz/的音.单词分别是:
seems
speaks
looks
practices
watches
knows

发/iz/的有:
practices ,watches
发/s/的有:
seems ,speaks ,looks
发/z/的有:
knows