名词
中文翻译：四线臂
同义词：
['four-wire arm', 'four-wire extension', 'four-wire armature']
例句：
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1. The four-wire arm is used to control the speed of a machine.
四线臂用于控制机器的速度。
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2.The four-wire arm was designed to improve the accuracy of the measurement.
四线臂的设计旨在提高测量的准确性。
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3. The four-wire arm is essential for maintaining the safety of the electrical system.
四线臂对于维护电气系统的安全至关重要。