马儿突然加速，开始飞奔起来。
The horse suddenly sped up and broke into a ___gallop.
看见开阔的草原，小马驹欢快地飞奔起来。
The young pony started to ___gallop happily when it saw the open grassland.
一群马正在田野上奔驰。
A group of horses is ___galloping across the field.
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