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1.The new series of actuators is more efficient than the old ones.
新型执行器比旧的更高效。
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2.The series actuators are designed to control the movement of machines.
这些执行器被设计用来控制机器的运动。
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3. The series actuators were developed to improve the accuracy of the system.
这些执行器的开发是为了提高系统的准确性。