名词
中文翻译：环形测角仪
同义词：
['circular protractor', 'ring compass', 'ring level']
例句：
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1. The engineer used a ring goniometer to measure the angle of the roof.
工程师使用环形测角仪来测量屋顶的角度。
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2. The surveyor used a ring goniometer to check the accuracy of the measurements.
测量员使用环形测角仪来检查测量的准确性。
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3. The architect used a ring goniometer to ensure that the building was square and level.
建筑师使用环形测角仪来确保建筑物是方形的并且水平。