内容纲要
st、sk、sp
st、ｓk、sp在重音里时要变音;
st、ｓk、sp词首变音，词尾不变音；
变音：skate ， skill， square ， stand ， sport ， speak ， study
不变音:interesting ， inspiring
浊化对应
S后加清辅音，必须重读时才变成相对应的浊辅音
清辅音：/p/ /t/ /k/
浊辅音：/b/ /d/ /ɡ/
英语音标变音
st、ｓk、sp在重音里时要变音;
st、ｓk、sp词首变音，词尾不变音；
变音：skate ， skill， square ， stand ， sport ， speak ， study
不变音:interesting ， inspiring
S后加清辅音，必须重读时才变成相对应的浊辅音
清辅音：/p/ /t/ /k/
浊辅音：/b/ /d/ /ɡ/
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