Shídài biàn le, zài tiě de jīnfànwǎn yě wèibì ānwěn.
Times have changed - even the most iron-clad gold rice bowl isn't guaranteed steady anymore.
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culture
Part of a job-status ladder in modern Chinese: 铁饭碗 (iron bowl - stable job), 金饭碗 (gold bowl - stable and lucrative), 泥饭碗 (clay bowl - precarious job). The bowl stands for one's livelihood.