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。