The appearance of the tones allowed the lax and tense vowels more freedom, and then the long and short vowels came into being.
声调的产生反过来又促使松紧元音进一步松化，出现了元音长短音的萌芽。
The appearance of the tones allowed the lax and tense vowels more freedom, and then the long and short vowels came into being.
声调的产生反过来又促使松紧元音进一步松化，出现了元音长短音的萌芽。
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