重力天体如地球，所施加的自然吸引力，如地球，对处于或接近其表面的物体有将它们拉向其中心的趋势 The natural force of attraction exerted by a celestial body, such as Earth, upon objects at or near its surface, tending to draw them toward the center of the body.
阻力流体介质，如水或空气对移动物体施加的阻力 The retarding force exerted on a moving body by a fluid medium such as air or water.
必然力环境施加的压力 The force exerted by circumstance.
我们应该对罪犯施加严厉的惩罚。 We should inflict severe chastisement on criminals.
