地心吸力

gravitation

-ly / structural particle: used before a verb or adjective, linking it to preceding modifying adverbial adjunct

earth / ground / field / place / land / CL:片[pian4]

the earth's core / geocentric

heart / mind / intention / center / core / CL:顆|颗[ke1],個|个[ge4]

to breathe / to suck in / to absorb / to inhale

attraction (in gravitation or electrostatics) / attractive force

(physics) attraction (gravitational, magnetic, electrostatic etc) / suction / (fig.) attraction (power to attract interest or liking)

power / force / strength / ability / strenuously