第三声指普通话阴平﹑阳平﹑上﹑去四类字调中的上声。
第三声由长降调和短升调组成。
两个第三声的汉字相连时，第一个字的声调变为第二声，第二个字的声调不变。
When there are consecutive third tones, the tone of the first character becomes the second tone while the second character stays the third tone.
而搭配声调则对初、中、高三个水平的美国学生第三声声调变异均产生影响，当搭配第三声或第四声时，学生将第三声发正确的比例大于搭配第一声或第二声的组合。
And all the American students of three levels were progressively more accurate when matching the third or the fourth tone than matching the first or the second tone.
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