A condition in which all acting influences are canceled by others, resulting in a stable, balanced, or unchanging system.

平衡。

Mental or emotional balance; poise.

(心情或心理的)平静。

[Physics] The state in which the sum of the forces, and torque, on each particle of the system is zero.

【理】平衡状态。对系统中所有外作用力及扭力总合为零。

[Chemistry] The state of a chemical reaction in which its forward and reverse reactions occur at equal rates so that the concentration of the reactants and products does not change with time.

【化】化学平衡。化学反应正逆反应速率相等时，个别反应物及产物浓度不再随时间变化而变化。