noun 下载 🔗分享 引力,万有引力 The fundamental force of attraction that exists between all particles with mass in the universe. It is the weakest of the four forces, and possesses a gauge boson known as the graviton. Examples : "The apple fell from the tree due to gravitation. " 苹果因为万有引力的作用从树上掉了下来。 physics astronomy space theory science 与AI对话词汇游戏阅读练习