Equilibrium is a balance between several different influences or aspects of a situation.
例句
Stocks seesawed ever lower until prices found some new level of equilibrium...股票在震荡中进一步下跌，直到股价达到某个新的平衡点。For the economy to be in equilibrium, income must equal expenditure.经济要达到平衡，收支必须均衡。
N-UNCOUNT
（内心的）平静，安宁
Someone's equilibrium is their normal calm state of mind.
例句
I paused in the hall to take three deep breaths to restore my equilibrium...我在大厅里停了一下，深吸了三口气以恢复平静。He had recovered his equilibrium and even his good humour, somehow.不知怎的，他已经恢复了平静，连心情也变好了。
英汉词典释义
n.
(心情、感情等)平静
Change in the world around us disturbs our inner equilibrium.我们周围世界的变化扰乱了我们内心的平静。
英英词典释义
Noun
1. a chemical reaction and its reverse proceed at equal rates
2. a stable situation in which forces cancel one another
3. equality of distribution
4. a sensory system located in structures of the inner ear that registers the orientation of the head