With the invention of high-temperature-superconductor, the superconductive magnetic gradiometer be-comes available in application.

由于高温体的研究成功，使磁梯度仪的际应用成为。

Gravity gradient is the second order derivative of gravitational potential, which can be observed by satellite gradiometer.

要重力梯度为重力位的二阶数，可以通过星载梯度仪进行观测。