In order to standardize pronunciation of vowels, phoneticians invented a diagram illustrating the side view of oral cavity and showing clearly the pronouncing positions of different vowels.
为了规范元音的发音，言语学家创造了语音图，即语音口腔剖面图，使瞧不见、摸不着的差别元音有了明确的发音定位。
In order to standardize pronunciation of vowels, phoneticians invented a diagram illustrating the side view of oral cavity and showing clearly the pronouncing positions of different vowels.
为了规范元音的发音，言语学家创造了语音图，即语音口腔剖面图，使瞧不见、摸不着的差别元音有了明确的发音定位。
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