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unstable equilibrium (physics)

不稳定平衡 不穩定平衡 bù​wěn​dìng​píng​héng
unstable equilibrium (physics)
A state where an object or system in equilibrium, when slightly disturbed, cannot return to its original position or state
unstable equilibrium (biology)
An ecological state where slight interference to inputs or outputs causes large fluctuations, preventing the system from maintaining balance