黑洞的引力场很强，光也无法逃出。

The gravity of a black hole is so strong that not even light can escape it.

是土地的粘性，还是文化的引力场？

Is it viscosity of land or gravitational field of culture?

结果表明：引力场度规与点质量引起的相似。

The results show that the metric is similar to that caused by a point mass.

广义相对论在此基础上加入了引力场对时间和空间的影响。

The general theory adds to this the effects on space and time of gravity.