顶身股、包身工、固定工与农民工反映百年中国劳动者身份地位演化走势；
The personal shares, the indentured laborers, the regular workers and the peasant workers reflect the trend of centurial evolution of Chinese laborers status.
淮北矿业集团机械总厂自行开发研制了液压千斤顶压装专用设备—缸柱压装机床，实现了千斤顶总装过程的自动化，减轻了工人的劳动强度。
The pressed assembly special equipment of hydraulic jacks, pressed assembly machine with hydraulic cylinder column is manufactured in the general mechinery plant of Huaibei Mining Industry Group.
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