重力天體如地球，所施加的自然吸引力，如地球，對處于或接近其表面的物體有將它們拉向其中心的趨勢 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.
阻力流體介質，如水或空氣對移動物體施加的阻力 The retarding force exerted on a moving body by a fluid medium such as air or water.
必然力環境施加的壓力 The force exerted by circumstance.
我們應該對罪犯施加嚴厲的懲罰。 We should inflict severe chastisement on criminals.
