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.
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。
2
From the perspective of the use of solar energy, the article analyzed principles of solar heating system and calculation method of the best solar fraction.
本文从太阳能利用的角度出发，分析了太阳能采暖系统的原理以及最佳太阳能保证率的计算方法。
3
The incident product factor of the evacuated solar energy collector tube is introduced for simplifies calculation about it.