名词
中文翻译：参考臂
同义词：
['reference point', 'measuring arm']
例句：
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1.The engineer used the reference arm to measure the angle of the beam.
工程师使用参考臂来测量梁的角度。
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2. The scientist attached a measuring arm to the microscope to get a more accurate measurement.
科学家将测量臂连接到显微镜上以获得更准确的测量结果。
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3. The construction worker used the reference arm to level the floor before starting work.
建筑工人使用参考臂来平整地板，以便开始工作。