gravitational

a.地心吸力的

gratifyingly, grating, gratingly, gratis, gratitude, gratuitous, gratuitously, gratuitousness, gratuity, grave, gravel, gravelly, gravely, graven, graven image, gravestone, graveyard, graving dock, gravitate, gravitation, gravity, gravy, gravy train, gravy-boat, gray, grayscale, graze, grazier, grazing, grazing land, grease, grease-gun, grease-paint, grease-proof paper, greasily, greasiness, greasy, great, Great Britain, great circle,