short and long vowels 短音及长音
The contact between languages consolidated the opposition of the long and short vowels.
语言间的接触强化了元音长短音的对立，导致长短元音最终确立。
There is a difference of duration and also of pronunciation between corresponding long and short vowels.
在符合之间有一种期间以及发音的不同长的和短元音。
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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