Opposition is essential to a true equilibrium of forces.

凡事都有正有反，正与反乃是平衡力量的要素。

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And then, according to the condition of limit equilibrium of forces, 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。

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This method is based upon the equilibrium of forces under ultimate loading, and consequently the effect of plasticity of the material is included in consideration.

这个公式是考虑板在极限平衡状态，考虑了材料的塑性。

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The theoretical foundation for ZIRP goes back to the Depression, when Keynes asserted that the normal forces of supply and demand could no longer reach automatic equilibrium.

FORBES: Magazine Article