An insecure or precarious job, often referring to employment in collective or private enterprises that lacks the stability and benefits of a state-guaranteed position.
他辞去了稳定的工作，选择了一份虽然有挑战性但是却是“泥饭碗”的创业机会。
He resigned from his stable job, opting for an entrepreneurial opportunity that, while challenging, was a "mud rice bowl" (an insecure job).
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