unstable equilibrium 【化】 不稳定平衡
Unstable \Un*sta"ble\, a. [Cf. {Instable}.]
Not stable; not firm, fixed, or constant; subject to change
or overthrow. -- {Un*sta"ble*ness}, n. --Chaucer.
{Unstable equilibrium}. See {Stable equilibrium}, under
{Stable}.