Opposition is essential to a true equilibriumofforces.
凡事都有正有反，正与反乃是平衡力量的要素。
2
And then, according to the condition of limit equilibriumofforces, a formula about non uniform sediment incipient was deduced.
并以该流速公式为基础，按照颗粒极限平衡的受力得出了非均匀沙的起动公式。
3
This method is based upon the equilibriumofforces under ultimate loading, and consequently the effect of plasticity of the material is included in consideration.