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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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.