in science, the force that attracts all objects towards one another

Particles are attracted to each other by gravitation. 粒子靠引力相互吸引。

an occasion when someone or something moves or is attracted in the direction of a particular thing or person

The gravitation of country people to/towards the capital began in the 1920s. 农村人口被吸引到首都始于20世纪20年代。