以下为句子列表：
英文: The method of velocity of light measuring with the CG-III of light velocity apparatus is improved, the measuring accuracy is increased significantly.
中文: 摘要对CG-Ⅲ型光速测定仪的测量方法作了改进，通过实际测量的结果表明，该实验方法改进后，光速测量的精度有了很大提高。
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英文: The velocity of light is about 186,000 miles per second.
中文: 光速大约是每秒十八万六千英里。
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英文: This article introduced the basic theory and method of measuring the velocity of light using the method of phase difference and how to measure the velocity of light using phase difference in air.
中文: 摘要介绍了一台自制的利用相位差法测量光速的仪器的基本原理和方法，并通过对光在空气中的传播速度的测定，使大家对用相位变化测量光速仪器有所了解。
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