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.
深蹲时人们常犯的错误就是弓背。
Main thing people do wrong when doing is a squat is they bend from the back.
第一下弓背跃起就把骑手摔下来的马。
这时，双手紧压地面，轻轻向后弓背，增加弧度。
Press down on the mat with your hands, gently increasing the arch in your back.
并且避免弓背。
随土层深度增加，若以棉花主茎垂直向下比喻为弓弦，则单作棉根干重的空间变化呈弓背形分布，而套作棉各土层根干重最大值出现的位点逐渐远离棉株。
The localities with maximum root dry weight in every layer of C distributed like a bow with vertical taproot as bowstring, and those of cotton in C-W were farther from cotton plant.
随土层深度增加，若以棉花主茎垂直向下比喻为弓弦，则单作棉根干重的空间变化呈弓背形分布，而套作棉各土层根干重最大值出现的位点逐渐远离棉株。
The localities with maximum root dry weight in every layer of C distributed like a bow with vertical taproot as bowstring, and those of cotton in C-W were farther from cotton plant.
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