The vertical component of force on a curved surface is equal to the weight of liquid vertically above the curved surface and extending up to the free surface.
作用于曲面上的压力的铅直分力等于曲面与其垂直向上延伸至自由液面间液体的重量。
He's the most important songwriter of the last 50 years, in a culture in which songwriting has always been a major force, a major component.
他是过去五十年里最重要的曲作者，而在美国文化中，作曲一直是主要的推动力和组成部分。
Don't get things mixed up, just the z component of the force becomes Gm triple integral of delta cos phi sine phi d rho d phi d theta.
不要搞混，只是力的z分量罢了,它是Gm∫∫∫δcosφsinφdρdφdθ
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