固若金汤
as firm as a rock.
eg：he will stick to his stand which is as firm as a rock.
中英俚语俗语来源：汉书："皆为金城汤池，不可攻也。 "
同义词：安如泰山 safe upon the solid rock.
反义词：不堪一击 the earthen pot must keep clear of the brass vessel.
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