箭头上的倒钩能防止猎物逃脱。
The arrow has a sharp ___barb to keep the prey from escaping.
监狱外围安装了带刺的铁丝网。
The prison is surrounded by ___barbed wire.
羽毛的细小倒钩帮助它保持形状。
The tiny ___barbs on the feather help it maintain its shape.
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