名词
中文翻译：Unknown
同义词：
['proof ball', 'proof sphere', 'proofing sphere例句：1. The proof sphere is used to test the accuracy of the measurement device.（证明球体用于测试测量设备的准确度。）2. The proof sphere was found to be in perfect alignment with the other parts of the machine.（证明球体被发现与机器的其他部分完美对齐。）']
例句：
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1. The proof sphere is used to test the accuracy of the measurement device.
证明球体用于测试测量设备的准确度。
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2. The proof sphere was found to be in perfect alignment with the other parts of the machine.
证明球体被发现与机器的其他部分完美对齐。
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3.The engineer carefully adjusted the proof sphere to ensure the accuracy of the measurements.
工程师仔细调整了证明球体，以确保测量的准确性。