The preconditions, additional conditions and reflectionlawsof variational principle are the complete elementary equations in elasticity.
弹性力学变分原理的先决条件、补充条件和反映的规律一起正是弹性力学全部基本方程。
2
The lawsof Tang dynasty strictly stipulated the outlay of market, using the penal code to administrate, which was the reflection of the favour of agriculture over commercials.