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1. The compound twister is used to rotate the screws in a machine.
复合扭力器用于旋转机器中的螺丝。
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2. The compound twister was designed to improve the efficiency of the machine.
复合扭力器被设计用来提高机器的效率。
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3. The compound twister was used to test the strength of the material.
复合扭力器被用来测试材料的强度。