The third part is the experimental analysis of Pakistani students' double words tone.
第三部分，巴基斯坦留学生双字调的实验分析。
Certain words can double as an expression of thanks as well as delight.
某些词既可以表达感谢，也可以表达喜悦。
Another example of this is words with double letters.
另外一个例子就是单词中的双字母。
Another example of this is words with double letters.
另外一个例子就是单词中的双字母。
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