事实上，如果从原点观察，由一个带点粒子产生的电场，其方程与上述方程是一样的，类似的例子还有磁场等等。
Actually, if you look at the electric field generated by a charged particle at the origin, it is given by exactly the same kind of formula, and there are magnetic fields and so on.
主要观察指标：年龄、绝经年限、绝经年龄、身高、体质量和人体质量指数与骨密度的相关性及回归方程。
MAIN OUTCOME MEASURES: the correlation between age, menopausal years, menopause age, height, body mass, BMI and bone density as well as the regression equation.
目的：观察老年性白内障术后血脂、血沉方程K值测定结果并分析其临床意义。
Objective: To examine and study the clinical significance of blood Lipids and Erythrocyte sedimentation rate equation K's value after the operation of senile cataract patients.
目的观察血液流变学主要指标及卡松方程参数在常见老年病诊断治疗中的临床应用价值。
Objective To study the clinical significance of Hemorheology examination parameters and Casson equation index in diagnosis and therapy of common geriatric disease.
从流体力学的基本方程出发，根据水下排气管口流动状态的观察，推导了柴油机水下排气管口辐射噪声与管口处气体流动参数之间的理论关系。
In the paper, we have done theoretical studies of sound radiated from the submerged exhaust exit when a diesel engine discharges pulsive exhaust gas into water.
从流体力学的基本方程出发，根据水下排气管口流动状态的观察，推导了柴油机水下排气管口辐射噪声与管口处气体流动参数之间的理论关系。
In the paper, we have done theoretical studies of sound radiated from the submerged exhaust exit when a diesel engine discharges pulsive exhaust gas into water.
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