由计算结果推测，地核占整个星球60%的体积，远比太阳系其他岩制行星，如金星，地球，火星中的比重大。
That core, calculation suggests, takes up around 60% of the planet's volume, making it far larger than the cores of Venus, Earth and Mars, the solar system's other rocky planets.
假设已知一个物体的重量和比重，我们就能算出它的体积。
Granted the weight and the specific gravity of a body, we can calculate its volume.
但更为重要的是，科学家和工程工程师们一直将一定体积的材料和同体积的水相比较，把比较的结果称之为“比重”。
But more important, scientists and engineers have since compared the weight of a volume of material with an equal volume of water and called the result Specific Gravity.
过共晶铝硅合金比重小、热膨胀系数低、耐磨性和体积稳定性好，是理想的活塞材料。
Hypereutectic Al-Si alloy which has small proportion, low coefficient of thermal expansion, good wear resistance and dimensional stability is an ideal piston material.
过共晶铝硅合金比重小、热膨胀系数低、耐磨性和体积稳定性好，是理想的活塞材料。
Hypereutectic Al-Si alloy which has small proportion, low coefficient of thermal expansion, good wear resistance and dimensional stability is an ideal piston material.
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