标准美语发音的13个秘诀 CD 2 Track 27

Exercise 1-54: Intonation¹ and Pronunciation of "That"                   CD 2 Track 27

That is a special case because it serves three different grammatical functions. The  relative pronoun and the conjunction are reducible. The  demonstrative pronoun  cannot be reduced to as chwa sound. It must stay [æ].  

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1 intonation   

n.语调，声调；发声

参考例句：

• The teacher checks for pronunciation and intonation.老师在检查发音和语调。
• Questions are spoken with a rising intonation.疑问句是以升调说出来的。