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

由于高温超导体研究成功，使得超导磁梯成为现。

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

摘要重力梯为重力位二阶导数，可以通过星载梯进行观测。