prone to change, fail, or give way; not stable
易变的;易动摇的;不稳固的;不稳定的
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the unstable cliff tops 不稳固的崖顶
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an unstable government .不稳定的政府。
prone to psychiatric problems or sudden changes of mood
易精神失常的;情绪易变的
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he was mentally unstable. 他精神上不稳定。