他们说没有正式文件的工人拉低了一些工作的工资，比如建筑行业。
They say undocumented workers push down wages in some jobs, like in the building industry.
尤其是技术行业，一个好的高级蓝领技术工人并不比白领差。
Especially the technology industry, a senior blue-collar workers is not better than white-collar.
尤其是技术行业，一个好的高级蓝领技术工人并不比白领差。
Especially the technology industry, a senior blue-collar workers is not better than white-collar.
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