on the job [ɔn ðə dʒɔb]

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（专心（工作着，忙碌着，正在工作，上班

When the overseer was not in, most of the workers would lie down on the job.只要监工不在，大多数工人就磨洋工。
He was fired when he loafed on the job.他因工作不认真而被开除。