在无限和真空的空间中，地磁场在强度上随距离3次方而衰减。
In a infinite and empty space the geomagnetic field falls off in strength with the third power of distance.
给出了无限边界元法的位移和面力插值函数，这些插值函数中含有衰减函数。
Displacement and traction interpolation functions, containing attenuation functions, are given by using this method.
标准上给出的归一化场地衰减（NSA）理论值的计算是基于发射和接收偶极子天线无限细这个假设得出的。
The theoretical NSA values given by the standards are grounded on the assumption that transmit and receive antennas are infinitesimal dipole antennas which is inappropriate to measurements.
标准上给出的归一化场地衰减（NSA）理论值的计算是基于发射和接收偶极子天线无限细这个假设得出的。
The theoretical NSA values given by the standards are grounded on the assumption that transmit and receive antennas are infinitesimal dipole antennas which is inappropriate to measurements.
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