弓背是汉语词汇，读音为gōng bèi，是指弓的弯成弧形的一侧。
那匹马扭动并猛然弓背跃起，使得骑手摔下马。
The horse twisted and bucked and finally dismounted its rider.
毛驴看见蛇时，猛然弓背跃起。
弓背鲑非常适应浑浊红色的河水（这也是河名的出处）中的低可见度，并可以借以躲避天敌。
The chub were well adapted to the poor visibilitycreated by the thick, red water which gave the river its name, and depended onit to hide from predators.
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