以下为句子列表：
英文: Applying the distance approximation to the expression already obtained for the required phase difference between two radiating elements yield equation (7-1).
中文: 在已经得到的两个辐射单元所需相位差的场方程（7-1）中应用距离近似。
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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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英文: This movie demonstrates the phase difference and the amplitude decay of the E and H field in a plasma medium.
中文: 本片演示等离子体态介质中电和磁场的相位差及振幅衰减情形。
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英文: This movie demonstrates the phase difference and the amplitude decay of the E and H field in a very lossy medium.
中文: 本片演示高损耗介质中电和磁场的相位差及振幅衰减情形。
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英文: This movie demonstrates the phase difference and the amplitude decay of the E and H field in freespace.
中文: 本影片可看出真空中电场和磁场之间的相位差和振幅衰减的现象。
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