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发音要领Essentials of Pronunciation
ai:是复韵母。前一个元音开口度大，发音长而响亮；后一个元音开口度小，发音短而轻，比较模糊。从前一个元音到后一个元音是自然滑行，不能跳跃。
Compound finals. The former vowel is more open, longer and louder while the latter one is narrow, short, weak and blurred. It is imperative to have a natural glide but not a sudden change from the former to the latter.
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