The first stage of the European Low Frequency Array (Lofar) telescope involves 96 radio antennae being erected this week in a field at the Chilbolton Observatory near Andover, Hampshire.

Lofar望远镜的一期工程位于罕布什尔的安多佛，由96个无线电天线组成的望远镜将在本周被安装完毕。

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Based on wave acoustics, the low frequency sound field is analyzed in this paper, and reciprocity is verified both theoretically and experimentally.

文章根据波动声学的观点对房间内的低频段声场做分析，理论和实验都验证了这个结论。

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The current measurement and control system in a Low-frequency Magnetic Field is a comprehensive system of hardware and software, including two parts: current measurement and computer control.

低频电磁场电流测控系统包括电流测试和输出控制两个部分，由软件和硬件相互配合组成一个完整的计算机控制系统。

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Although they have not been found to cause any harm, the cables on conventional pylons, which transmit a three-phase alternating current, generate a strong electric field and a continuous buzz of low-frequency radio waves.

ECONOMIST: Monitor