Note the use of the vowel sound in should and must when they are pronounced quickly.

注意should和must中快速发音时元音的发音.

超越目标英语 第3册

Look at my lip - position when I pronounce this vowel sound.

我发这个元音时,请看着我的唇位.

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In this sentence, the vowel sound become reduced to a central vowel.

此句中这个元音弱化为中元音.

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Look at my lip position when I pronounce this vowel sound.

我发这个元音时请看我的唇位.

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