冷不防重重地落在下巴上的一击使拳击手站立不稳，向后一个趔趄。
The fighter reeled back when the heavy blow landed unexpectedly on his chin.
是鼻韵母。在发第一个元音时，首先要圆唇，然后，很快滑向后一个音节。
Is a nasal final. When pronounce the first final, you should round your lips, and then it glides quickly to the second vowel.
这匹马向后一仰，摔下骑手并撞倒站在它旁边的一个年轻人。
The horse reared, throwing its rider and knocking down a youth standing beside it.
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